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MS4 TMDL Annual Report FY18-19 City of Lake Oswego, Oregon National Pollutant Discharge Elimination System Municipal Separate Storm Sewer System Annual Report Covering July 1, 2018 to June 30, 2019 Prepared for the Oregon Department of Environmental Quality October 31, 2019 ,ram -- 0 OREGO� Page intentionally blank CITY OF LAKE OSWEGO NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES) MUNICIPAL SEPARATE STORM SEWER SYSTEM (MS4) ANNUAL REPORT Aux 1,2018—JUNE30,2019 I,the undersigned,hereby submit this National Pollutant Discharge Elimination System(NPDES)Municipal Separate Storm System (MS4) annual report in accordance with NPDES Permit Number 101348. I certify, under penalty of law, that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to ensure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person, or persons, who manage the system,or those persons directly responsible for gathering the information,the information is,to the best of my knowledge and belief,true,accurate,and complete. I am aware that there are significant penalties for submitting false information including the possibility of fine and imprisonment for known violations. /o. f //9 M rtha BenneXt-it1l�lanager Date I City of Lake Oswego Page intentionally blank TABLE OF CONTENTS 1 Introduction 1 2 Stormwater Budget 1 3 Development 1 3.1 Annexations 2 3.2 Stormwater Review 2 3.2.1 Land-Use Review 3 3.2.2 Construction Plan Review 3 3.3 Stormwater Management 3 3.3.1 Impervious Area 4 3.3.2 Public Stormwater Facilities 4 3.3.3 Private Stormwater Facilities 5 3.4 Retrofit and Hydromodification Projects 6 4 Stormwater Monitoring Program 6 4.1 Instream Monitoring 8 4.1.1 Wasteload Allocations 8 4.1.2 Other Water Quality Data 9 4.2 Continuous Monitoring 9 4.3 Wet Weather Monitoring 12 5 Stormwater Management Plan 12 5.1 Illicit Discharge Detection and Elimination (IDDE) 12 5.1.1 Spill Response and Enforcement 14 5.1.2 Industrial and Commercial Facilities 14 5.2 Construction Site Runoff Control 14 5.3 Public Education and Outreach 15 5.4 Public Involvement and Outreach 15 5.5 Pollution Prevention for Municipal Operations 15 5.5.1 Stormwater Infrastructure 16 5.5.2 Wastewater Infrastructure Effects 16 5.5.3 Street Sweeping and Winter Maintenance 16 5.5.4 Pesticide Applications 16 5.6 Stormwater Facility Management 16 5.6.1 Public Stormwater Facilities 16 City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page i 5.6.2 Private Stormwater Facilities 17 6 Adaptive Management 17 Appendix A Lake Oswego Monitoring Data 19 Appendix B 2012 SWMP Implementation Status 31 Appendix C. TMDL Implementation Plan, 2018-2019 Annual Report 39 C.1. Introduction .. 41 C.2. TMDL Implementation Plan Revisions 41 C.3 Development 42 C.4 Water Quality 43 C.5 Temperature .. 44 C.5.1 Preservation of Riparian Habitat 44 C.5.2 Enhancement of Riparian Habitat 46 C.6 Adaptive Management 46 C.7 Other Activities 46 List of Tables Table 1. Historical and Forecasted Stormwater Budget, FY1617 to FY1920 2 Table 2. History of Annexations, FY1516 to FY1819 2 Table 3. Impervious Area Treated by Public Stormwater Facilities, FY1819 5 Table 4. Impervious Area Treated by Private Stormwater Facilities, FY1819 5 Table 5. Wasteload Allocations for Streams in Lake Oswego Stream Monitoring System 8 Table 6. Summary of Selected Stream Monitoring Data, FY1819 and FY1213-FY1617 10 Table 7. Summary of Wet Weather Sampling, FY1819 and FY1213-FY1617 13 Table 8. Spills and Illicit Discharge Investigations in Lake Oswego, FY1819 14 Table 9. Pesticides Used on City Property, FY1819 17 Table A.1 Nettle Creek abv Tryon Creek, Instream Monitoring Results, FY1819 21 Table A.2 Lost Dog Creek at Lake Front Rd, Instream Monitoring Results, F1819 22 Table A.3 Springbrook Creek at Iron Mountain Blvd, Instream Monitoring Results, FY1819 23 Table A.4 Boones Ferry Creek at Bryant Rd, Instream Monitoring Results, FY1819 24 Table A.5 Ball Creek bel Kruse Way, Instream Monitoring Results, FY1819 25 Table A.6 Carter Creek abv Bangy Rd, Instream Monitoring Results, FY1819 26 City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page ii Table A.7 Wet Weather Results at Reese Rd and at South Shore Blvd, December 20, 2018 27 Table A.8 Wet Weather Results at Reese Rd and at South Shore Blvd, February 1, 2019 28 Table A.9 Wet Weather Results at Reese Rd and at South Shore Blvd, March 27, 2019 29 Table B.1 Stormwater Management Plan Metrics, FY1819 Progress 31 Table C.1. TMDLs for which Lake Oswego is the DMA 41 Table C.2. History of Annexations and Impervious Area, FY1516 to FY1819 42 Table C.3. TMDL Parameters and Example Related City Activities to Reduce Loads 43 Table C.4. Selected Water Quality Data from Instream Monitoring Stations 45 Table C.5. Backyard Habitat Program Participation, FY1516 to FY1819 47 Table C.6. Requested Adaptive Management 48 Table C.7. Metrics for TMDL Management of Stream Temperatures 49 List of Figures Figure 1. Annexations in Lake Oswego, FY1516 to FY1819 3 Figure 2. Impervious area in Lake Owego, 2019 4 Figure 3. Stream Monitoring Sites in Lake Oswego 7 Figure C.1. Annexations in Lake Oswego, FY1516 to FY1819 42 Figure C.2. Backyard Habitat Program Participation, FY1516 to FY1819 47 City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page iii This page intentionally left blank City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page iv 1 INTRODUCTION The Clean Water Act (CWA) was enacted in 1972 to "restore and maintain the chemical, physical, and biological integrity of the Nation's waters". After point sources such as industrial areas and wastewater treatment plants were regulated as part of the National Pollutant Discharge Elimination System (NPDES) program, the USEPA found that the rivers and streams were still in need of water quality improvement. As a consequence, the NPDES Municipal Separate Storm Sewer System (MS4) permit program was implemented in 1990 to regulate stormwater discharges from municipalities, counties, and other entities that met the MS4 permit thresholds of either being in an urbanized area or having a minimum population of 10,000 plus a density of 1,000 people/square mile. The City of Lake Oswego (City) received its first MS4 permit from Oregon Department of Environmental Quality(DEQ) in 1995 as a co-permittee of Clackamas County. The Phase I Clackamas County permit (No 101348) includes Clackamas County, Oak Lodge Sanitary District, and the cities of Lake Oswego, Milwaukie, Gladstone, West Linn, Oregon City, Wilsonville, Happy Valley, Johnson City, and Rivergrove. The City's current permit was issued in March 2012, expired in March 2017, and is currently on administrative extension. Annual reports, assessments, and other related regulatory documents can be viewed on the City website at http://www.ci.oswego.or.us/publicworks/permits-plans-and-reports. 2 STORMWATER BUDGET The City's stormwater program is funded primarily through monthly stormwater fees and is based on the number of equivalent service units (ESU) assessed for the property. An ESU is the average amount of impervious area for residential properties and has been calculated as 3,030 sq ft. Stormwater systems development charges (SDCs) are used to alleviate capacity issues but, since the City is largely developed, many projects are exempt from SDCs and they comprise a small portion of the total budget. They are collected when a building permit is issued for previously unconnected properties. Monthly stormwater fees for a single family/duplex residential property was $15.41 in FY1819 and are $16.49 in FY1920. SDCs were $157 per ESU for FY1819 and are$162 per ESU for FY1920. In FY1819, the City spent $2.4 million dollars on stormwater projects, maintenance, and compliance programs with a large portion of those funds spent on capital improvement projects (see Table 1). In FY1920, the City expects to spend $5.0 million dollars with about 40% of the funds set aside for capital improvement projects. The largest capital improvement project for FY1920 is the rehabilitation and improvement of Wembley Park Rd which will include new stormwater treatment and conveyance structures. Table 1 includes budgets from Engineering and Public Works. They do not include related programs such as the portion of the Planning Department's budget used for its Urban Forestry programs and code enforcement of sensitive lands and tree canopy; the budget from the Parks Department that is used for maintenance of City-owned properties and Master Plan development; and funds disbursed through partnerships such as the Backyard Habitat Program, Neighborhood Grants, and the Habitat Enhancement Program. These programs can positively affect water quality; some are used for stormwater education. 3 DEVELOPMENT With the current MS4 permit in administrative extension and an expectation that it will be renewed in FY2021, the City made no changes in the stormwater code nor in the documents addressing stormwater City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 1 management. There were no comprehensive plan changes nor zoning changes that affected stormwater discharges. The urban services boundary did not change nor is it expected to change in FY1920. No concept planning or activities were completed in FY1819 that were associated with urban growth boundary changes or land annexation. Table 1. Historical and Forecasted Stormwater Budget, FY1617 to FY1920 FY1617 Actual* FY1718 Actual* FY1819 Actual* FY1920 Budgeted Program Operations $1,201,952 $2,302,461 $ 561,814 $928,000 Program Management $536,022 $ 881,585 $ 185,578 $ 1,417,000 Capital Projects $392,163 $1,414,601 $1,707,052 $2,014,000 Contingency $ 648,000 Total 2,130,137 $4,598,647 $2,454,444 $5,007,000 *These numbers are not audited 3.1 Annexations Thirteen properties were annexed in FY1819 (see Table 2). They added only 6.6 acres to the City's boundaries reinforcing the assumption that most properties in the City's urban services boundary are urbanized lots and that development is limited to infill, partitions, or redevelopment. Many of the annexations in the last four years have been in the western and north central sections of the City (see Figure 1). Table 2. History of Annexations, FY1516 to FY1819 Year Annexations Acres Annexed FY1819 13 6.6 FY1718 9 4.0 FY1617 11 6.6 FY1516 27 22.0 Of the 13 annexations approved in FY1819, two properties were further subdivided into two (four lots total from the original two original lots) and one property owner attended a pre-application conference for a partition but took no further action. Based on currently submitted applications, the City expects to annex approximately four acres in FY1920. 3.2 Stormwater Review Private development is governed by the City's municipal code, stormwater management manual (SWMM), and engineering design standards. The City's philosophy for reducing stormwater from capital improvement projects and City-owned properties is to follow the same requirements as private development. There were no changes to the City's stormwater code, SWMM, or engineering design standards in FY1819. City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 2 r // / // ! �i/ 7 /' / Annexation Year i'/�!/ %i�/% /r// %/:�> /,i Annexation Year / Tualatin River aio Watershed MI5 j "�' / �zne j /�j � / .,, / 2 ii z4r n ek/i/ zoie y, cM Lr� %% 6, clh/saunden Spnngbrook Creek /// / A / /./ Watershed ' % ,/. , ,, , / ,....„ ,, „„ , __,,, ,,,„,„ 7 / �' /, ,�//' i %/ q i o,ga1-'" Springbrook / I Creek s �1--? ; Watershed _,•,,,,i5 Oswego Lake f coe9° Watershed / ��a Willamette River 1"n i' Watershed 1 Oswego Lake Tualatin River _ Watershed t Watershed w 1 '`-J City of Lake Oswego City of Lake Oswego r r— Watersheds and Annexations i Watersheds and Annexations i - Tualatin River Watershed ,z_ i Figure 1. Annexations in Lake Oswego, FY1516 to FY1819 3.2.1 Land-Use Review Projects are required to provide onsite stormwater management for the 10-yr 24-hr design storm to the maximum extent possible. Projects that create 3,000 sq ft or more of impervious area are expected to meet water quality requirements as well as flow requirements. No treatment or flow requirements are required if large projects discharge directly, or through manmade infrastructure, to the Tualatin River, Oswego Lake, or the Willamette River. The City had 54 project applications that went through the land-use process in FY1819 including four commercial projects and eight institutional projects. Of the commercial projects,two were for mixed-use development, one was for a multi-family project, and the fourth was for a greenhouse. The institutional projects included two City projects(City Hall and Iron Mountain Park)and six were for Lake Oswego School District projects located at various sites throughout the City. It is not expected that these projects will result in businesses requiring a DEQ 1200-Z permit. 3.2.2 Construction Plan Review Staff reviews private development projects for compliance with the stormwater requirements. Due to staff changes, no information is available on the number of construction plans that were reviewed. 3.3 Stormwater Management The MS4 permit requires the City to mimic pre-construction hydrology to the maximum extent practicable with onsite stormwater management as the preferred strategy. The City's SWMM complies with this City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 3 requirement by requiring onsite infiltration of the 10-yr 24-hr design storm to the maximum extent practicable. 3.3.1 Impervious Area The City currently contains 11.4 square miles (7,320 acres)within its boundaries; 32%or 3.6 square miles are impervious(see Figure 2). The impervious area in the City's urban services boundary is 4 square miles. The relatively small increase in impervious area (7 acres or<1%) reinforces the assumption that most of the City is developed and that development is either infill, partitions,or redevelopment of already existing impervious area. i i 7 l f-':' -Imperfaus Sudaws w@h'n Lake Oswege C@Y Llml[s � , 'i i -Impery ous 5urfacos wrthn Urban Scry cos Arca Urban Services Boundary S ♦\'f_4 . 1 1 j__.j Lake Oswego Boundary F • + . A�--.tf _ ! Park or Open Space i.lA y n , . rig_ k i '.4' 40,,, �t °rc-, -7'1.'1� '�i x�- €� aft -7 ,� ( h e ice,_ , i k- � rr ., r-- -,,,s • •^r 'F1Tkm � . F"�I r 'J ,Ir /-:-4iii ''''- :, .A, rr. ,. ,..",— , , . .1.-_—_! 0 Ag mvig .,„ , - - . „..I i ." : ., . .....r J. F .0, ., . ,... wit, ,i.. .. . ._ . r.1 s, City of Lake Oswego .�'e. ; Impervious Surfaces NI 1 ti 0 0.25 0.5 0.75 1 uam_eF"7 �- ks. Ales1 Figure 2. Impervious area in Lake Owego, 2019 3.3.2 Public Stormwater Facilities Developers submitting applications for partitions and subdivisions are required to meet the requirements of the SWMM. Developments add public stormwater facilities as part of the private development process. Four projects were required in FY1819 to provide public stormwater facilities (see Table 3) as part of the land-use process. All of these private developments utilized bioswales for public stormwater management. The bioswales wil treat 5,895 sq ft of impervious area with an additional 540 sq ft discharged to a pervious area. A realignment of Lakeview Blvd with Jean Rd (a capital improvement project) resulted in a large raingarden/detention pond that treats 9,833 sq ft of previously untreated impervious area. City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 4 Table 3. Impervious Area Treated by Public Stormwater Facilities, FY1819 I Springbrook I I I Willamette Facility Type Oswego Lake Creek Tryon Creek Tualatin River River Total By Type %of Sq ft Acres Sq ft Acres Sq ft Acres Sq ft Acres Sq ft Acres Acres Total Bioswale 4,695 0.11 - - 1,200 0.03 - - - - 0.14 37.8% Raingarden 9,833 0.22 - - - - - - - - 0.22 59.5% Sheet Flow - - - - 540 0.01 - - - - 0.01 2.7% Total 114,5281 0.33 I - I - I1,740I 0.04 I - I - I - I - II 0.37 I I 3.3.3 Private Stormwater Facilities Stormwater facilities were constructed for 109 projects in FY1819 (see Table 4) with most of new or replaced impervious area occurring in the Oswego Lake and Tryon Creek watersheds. The least impervious area was created in the Willamette River watershed. Table 4. Impervious Area Treated by Private Stormwater Facilities, FY1819 I Springbrook I 1Tualatin I Willamette Facility Type Oswego Lake Creek Tryon Creek River River Total By Type %of Sq ft Acres Sq ft Acres Sq ft Acres Sq ft Acres Sq ft Acres Acres Total Rain Garden 9,120 0.21 16,446 0.38 - - 7,120 0.17 - - 0.76 7.5% Bioswale 1,040 0.02 - - 483 0.01 1,338 0.03 2,604 0.06 0.12 1.2% Infiltration Planter - - - - - - - - - - - - Flow-Through Planter 18,415 0.42 - - 68,979 1.59 10,098 0.23 12,936 0.30 2.54 25.2% Porous Pavement - - - - - - 508 0.01 - - 0.01 0.1% Permeable Pavers 1,153 0.03 1,174 0.03 387 0.01 - - - - 0.07 0.7% Infiltration Trench/ Galleries 101,996 2.34 7,720 0.18 27,073 0.62 16,582 0.38 5,970 0.14 3.66 36.3% Dry Wells 49,964 1.15 23,280 0.53 14,041 0.32 - - 2,592 0.06 2.06 20.5% Sheet Flow 13,059 0.30 3,466 0.08 998 0.02 1,285 0.03 144 0.00 0.43 4.3% Below Threshold 9,319 0.21 1,952 0.04 4,732 0.11 1,742 0.04 1,072 0.02 0.42 4.2% Total 204,066 4.68 54,038 1.24 116,693 2.68 38,673 0.89 25,318 0.58 10.07 100% Green Infrastructure 29,728 0.68 17,620 0.41 69,849 1.60 19,064 0.44 15,540 0.36 3.49 34.7% %Green Infrastructure 14.6% 32.6% 59.9% 49.3% 61.4% NA NA Percent Untreated 4.6% 3.6% 4.1% 4.5% 4.2% 0.42 4.2% City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 5 As shown in Table 4,the primary methods of stormwater treatment are dry wells and infiltration galleries (56.8%). Because infiltration creates shallow groundwater (interflow) that replenish streams during the dry summers, it is expected that focusing on infiltration facilities for stormwater management will increase water quality in watersheds that have a temperature TMDL. The MS4 permit also requires prioritization of green infrastructure which is defined as rain gardens, bioswales, planters, porous pavement, and permeable pavers. Green infrastructure constructed in FY1819 treated 34.7%of the stormwater created by development in the city. Some developments do not create enough impervious area to trigger the stormwater requirements (see "below threshold" above). This may be because they do not trigger the 1000-sq ft threshold or they may discharge directly to Oswego Lake, the Tualatin River, or the Willamette River (see Section 3.2.1). In FY1819, only 4.2%of the impervious area created in the city was untreated. Two industrial projects,on Jean Rd and on Willow Lane,were completed in FY1819. Both used infiltration galleries to manage the stormwater created by their development. 3.4 Retrofit and Hydromodification Projects In general, capital improvement projects are comprehensive in nature; they repair, replace, or upgrade wastewater,water,stormwater, and pavement. Many projects are delayed or fast-tracked depending on the funding acquired, new information regarding current conditions, or acquisition of right-of-way. Two capital improvement projects completed in FY1819 are considered retrofits although neither was included in the City's 2016 Retrofit Assessment. The Lakeview Blvd realignment gained five new sumped catchbasins and a large raingarden to treat 9,833 sq ft of previously untreated impervious. Catchbasins in the Country Club Rd project boundaries were retrofit with 7 sumps to treat 80,000 sq ft of previously untreated impervious area. While not a large retrofit, one catchbasin was retrofit with a sump to treat water quality as part of a signalization project. No projects were completed in FY1819 that addressed hydromodification. One project, D Avenue, is considered a retrofit and hydromodification project but was not completed as of June 30, 2019. It will be included in the FY1920 report. 4 STORMWATER MONITORING PROGRAM As part of its MS4 permit, the City collects monthly instream water samples for a variety of parameters such as metals, nutrients, hardness, and bacteria. In addition, the City collects flow data and other field parameters such as pH, dissolved oxygen, stream temperature, and conductivity. Each quarter, the City also collects samples for cations, anions, and organic carbon at its six sites. Samples from three storm events are collected for the same parameters as the monthly instream effort. The City maintains continuous monitoring stations at Lost Dog and Springbrook Creek. The City also provided $1,740 in FY1819, in collaboration with other permittees and the USGS,to operate and maintain the USGS hydrological station (14207500) on the Tualatin River at West Linn. City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 6 ' y�i\---........) o ' To Portia i 1 ! r l _ _-_ _ �� I �/ '1 --�� \ Locations of Required Water t o 0 • i� , �� �F�RA �y������ -�Quality Monitoring ICD Aii ins. .CR10 r' S' ?foil, ,„ 'I.. , r w Station Type&Obligating Permit 41 ,, v ' '�`� `�� ,..__ ,k .,__, * Instream[MS4] t �. KIv r�� Wet Weather[M54] �® 1A ! S WY `� � +� ,-� r#ll.�.. Oo Q M Water Bodies .�' �`►LS ;"qiiit l I Q AMP" .. •I " Streams a ,fD .S �-1 I_n S1 — i" ""� 1 V a Wetlands N r 4 ,„,,.... I l— USB&City Limits co �► I ake r' C I5' �' 0S�r� �L i �Jgdc [r I r? - c �� Jam.__ = f/ /l / ' .� )�p- 1 T �r9 1D • ce \ t 402''' 1 tf ~o „-. y 1 .. I.._ J I BERGIS RD ` � /, F. I/ c00 * m , -�" / O i, .:�� j JEAN RD L) a. -- p �� - r / ` �o �' f .,� f I / / , —7-... '' P Ct To West Li .---"/ ' )......77X C—: — 1 )--( ::)...., ot, _ Tom;I / v v,A ,O fD ��. u a1V"� c tiT iO4 (..�,�r.J 1 11 , 1 `I I I 'r) I ,.),,To Tualatin a NAD_ig8�HARN_StatePl ne bregon_NorthFIP5�6oi feet_lirtl U �� C v I(f[�I "'�" Projection:Lambert Confo r mal_Conic, - o.� r -- i.5 �z r` 1J Dat from RLIS,DOGAMI&City of Lake swego;Anne MacDonald,DEG,11/16h5 . oRFgo'' Miles Figure 3. Stream Monitoring Sites in Lake Oswego 4.1 Instream Monitoring Monthly sampling is conducted at six sites (see Figure 3). Three of the sites discharge into Oswego Lake, two discharge to Fanno Creek (a tributary of the Tualatin River), and a third discharges to Tryon Creek (a tributary of the Willamette River). Appendix A contains detailed data from the instream monitoring effort. 4.1.1 Wasteload Allocations The City has several wasteload allocations (WLAs) affecting four of its watersheds and all six monitoring sites (see Table 5). Bacterial WLAs affect three of its watersheds while phosphorous affects two of its watersheds. Table 5. Wasteload Allocations for Streams in Lake Oswego Stream Monitoring System. Affected Lake Waterbody Oswego Streams Parameter Wasteload Allocation Ball Creek 5,000 counts/day(winter rain event) Fanno Creek Carter Creek Bacteria (E.Coli) 12,000 counts/day mL(summer rain event) 406 colonies/100 mL(non-rain grab sample) Ball Creek Fanno Creek Carter Creek Total phosphorous 0.13 mg/L Ball Creek DO Fanno Creek Carter Creek (TSS as a surrogate) 50%reduction in TSS(summer) Springbrook Creek Oswego Lake Lost Dog Creek Total phosphorous 0.09 mg/L(summer) Boones Ferry 0.15 mg/L(winter) Willamette River Tryon Creek Bacteria (E.Coli) 78%reduction Springbrook Creek Springbrook Creek Bacteria (E.Coli) 80%reduction *In the interest of clarity,only the WLAs affecting the monitored streams are listed. **TSS is total suspended solids 4.1.1.1 Bacteria(E.Coli) The bacterial WLA for Fanno Creek tributaries is 406 colonies/100 ml for grab samples. The average summer concentration for Ball Creek was slightly elevated above the WLA while the concentration in Carter Creek was well below it. The bacterial WLA for Springbrook Creek requires a reduction of 80%throughout the year. The City has had difficulty reaching this benchmark however the average summer concentration is just above the 406 colonies/100 mL threshold set for most bacterial grab samples while the average concentration throughout the year is well below the threshold (196 colonies/100 ml). The average bacterial concentrations for all other sites were well below the WLA of 406 colonies/100 ml for grab samples. Ball Creek and Springbrook Creek both have parks and green spaces which may be contributing to the bacterial levels;Springbrook Creek also has a horse facility near the sampling site. Concentrating on public education and continuing to locate potential wastewater exfiltration from failed septic systems and public wastewater lines may help to reduce concentrations. 4.1.1.2 Dissolved Oxygen The dissolved oxygen WLA requires a 50%increase in concentrations during the summer for Fanno Creek. The settleable volatile solids concentrations in the summer only showed a decrease of 6% and 8% in Ball Creek and Carter Creek, respectively. Total suspended solids, another indicator of dissolved oxygen, City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 8 showed a decrease of 13% in Ball Creek but an increase of 28% in Carter Creek. Using the City's field meter (YSI ProPlus), the summer concentrations for dissolved oxygen showed an increase in Ball Creek and Carter Creek of 4% and 6%, respectively. In general, the dissolved oxygen range has decreased between historical and FY1819 levels resulting in a more stable environment. 4.1.1.3 Phosphorous Fanno Creek tributaries have a summer phosphorous WLA of 0.13 mg/L. Ball Creek remained below the WLA. While Carter Creek had a summer phosphorous concentration of 0.15 mg/L, the geomean for the year was only 0.10 mg/L. The Oswego Lake watershed has phosphorous WLA of 0.15 mg/I in the winter and 0.09 mg/I in the summer. Tributaries of Oswego Lake which are part of the monitoring network include Springbrook Creek, Lost Dog Creek, and Boones Ferry Creek. Summer concentrations in Springbrook Creek and Boones Ferry Creek were slightly elevated in the summer (0.10 and 0.11 mg/L, respectively), however concentrations at all three sites remained below the 0.15 mg/I winter WLA. Phosphorous concentrations will likely be more difficult to reduce given that the dissolved fraction is a major constituent of the total phosphorous concentration. Efforts on proper fertilizer application and minimizing fertilizer use while concentrating on reducing suspended solids and streambank erosion may help stabilize phosphorous concentrations. 4.1.2 Other Water Quality Data As shown in Table 6,the maximum concentrations of many analytes were greatly reduced in FY1819 from historical concentrations. In some instances, such as total lead in Lost Dog, the maximum concentration was below or near the average historical concentration. Total suspended solids saw reductions for all sites, except Springbrook and Carter Creek, and was a likely factor in the reductions seen for total metals. Ammonia and nitrate saw reductions in the maximum concentrations as well as most average concentrations. Stream temperatures also saw reductions or stayed at historical levels. pH concentrations should be between 6.5 to 8.5 (OARS 340-041-0345(1)). In FY1213 to FY1617, the geomean for pH remained between 6.5 and 8.5 but maximums for all streams exceeded the range. In FY1819,the maximum levels, as well as the summer and winter levels,for all streams remained within the required range. 4.2 Continuous Monitoring The Lost Dog Creek gaging station at Lake Front Road was upgraded in October 2018 and January 2019 with a new water quality sonde and cell modem. The water quality data was rated as poor to fair due to turbulence, biofouling, and problems with the integrity of a sensor. It is expected that the data for FY1920 will be more reliable after replacing the sonde and relocating it out of the turbulent area. The Springbrook Creek gaging station at Iron Mountain Road was upgraded in April 2018 with a new submersible pressure transducer to measure stage and a new water quality sonde. The water quality data for FY1819 was rated fair to good with two sensors (temperature and conductivity) needing to be replaced by the manufacturer. It is expected that relocating the sonde further downstream to avoid turbulence and continued regular maintenance of the station will result in better data for FY1920. City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 9 Table 6. Summary of Selected Stream Monitoring Data, FY1819 and FY1213-FY1617 J J J _ T. E bA E Z b0 a dp bA bA J J ago ` � E _ o o m � m � E c�a � E E E Sao Sao Ca +j ° „ 0. w z tr mm E0 a 4 E 3 .o c E u a N v) V) O T a Z Z a . H . I- 1- o o 2 0 Lost Dog at Lake Front Rd Maximum 1.9 18.2 13.02 7.82 649 0.030 1.37 0.171 0.10 0.0070 0.0003J 0.0290 5.0 43 Geomean 0.3 10.3 10.04 7.40 64 0.005J 0.61 0.070 0.05 0.0018J 0.0001' 0.0173 <2 30 Minimum <0.1 4.9 7.07 6.90 14 <0.0012 0.27 0.028 0.02 0.0002J 0.0001' 0.0100 <2 21 Summer 0.2 15.5 8.58 7.35 75 0.003 J 0.44 0.093 0.07 0.0028 0.0001' 0.0152 2.2 26 Winter 0.5 7.8 11.13 7.43 48 0.006J 0.80 0.055 0.03 0.0013' 0.0001J 0.0179 <2 33 Historical Maximum ND 20.6 16.17 8.57 1203 0.660 2.30 1.600 0.31 0.0330 1 0.0015 0.1760 48.0 54 GeoMean ND 11.4 9.33 7.68 75 0.023 0.70 0.080 0.05 0.0020 1 0.0003' 0.0155 2.6 27 I Minimum ND 3.3 1 4.43 6.79 <1 <0.0012 0.03 0.025 0.01 0.0009' <0.0000067 0.0050 <2 <10 Summer ND 16.2 7.79 7.55 49 0.012 0.42 0.097 0.06 0.0025 1 0.0001' 0.0131 2.0 27 Winter ND 8.6 11.04 7.63 97 0.016 0.99 0.065 0.04 0.0019' 0.0003' 0.0176 2.8 28 Springbrook at Iron Mountain Blvd Mean 4.1 11.5 9.14 6.74 568 0.022 0.72 0.105 0.07 0.0025 1 0.0004' 0.0158 7.1 31 Geomean 3.3 11.0 8.94 6.73 196 0.018 0.70 0.103 0.07 0.0016J 0.0001' 0.0097 3.5 30 Minimum 1.8 6.3 6.85 6.27 30 0.010 0.52 0.072 0.05 0.0006J 0.00003J 0.0044 <2 23 Summer 2.2 14.1 7.27 6.59 407 0.025 0.72 0.103 0.08 0.0013' 0.0001' 0.0077 2.4 28 I Winter 4.3 9.3 10.06 6.83 116 0.015 0.68 0.103 0.06 0.0020 1 0.0002' 0.0114 4.6 31 Historical Maximum ND 15.9 12.40 8.65 2076 0.115 1.70 1.850 2.50 0.0115 1 0.0085 0.1100 253.8 120 GeoMean ND 11.3 18.06 7.12 80 0.023 0.77 10.119 0.09 10.0013 J I 0.0003" I0.0073 3.1 32 I Minimum ND 5.4 15.02 6.41 8 <0.0012 0.31 10.042 0.03 10.0003'I<0.0000067 I0.0019 <2 <10 I Summer ND 14.2 7.08 6.88 115 0.018 0.77 0.117 0.10 0.0011' 0.0001' 0.0057 2.9 30 I Winter ND 9.5 1 9.31 7.14 97 0.020 0.75 0.118 0.08 0.0016' 0.0003' 0.0097 3.6 34 Boones Ferry at Bryant Rd Max 4.8 16.1 11.17 7.01 1120 0.080 4.08 0.163 0.11 0.0050 0.0009 0.1680 47.5 72 Geomean 0.2 11.7 8.88 6.80 41 0.012 2.90 0.102 0.09 0.0015 J 0.0001' 0.0194 2.2 39 Min <0.1 6.9 7.50 6.42 2 <0.0012 1.19 0.081 0.07 0.0007' <0.0000067 0.0080 <2 18 Summer 0.1 14.2 8.04 6.82 92 0.026 3.15 0.111 0.09 0.0016J 0.0001' 0.0258 2.6 49 Winter 0.5 10.2 9.41 6.79 23 0.006' 2.73 0.095 0.09 0.0015J 0.0001J 0.0158 2.0 33 Historical Maximum ND 16.1 12.15 8.61 1046 0.100 6.20 1.000 0.25 0.0130 1 0.0066 0.1200 100.0 160I GeoMean ND 12.0 18.12 7.13 20 0.017 3.01 10.135 0.09 10.0017 J I 0.0003" I0.0149 4.8 144 I Minimum ND 3.3 12.56 6.49 <1 <0.0012 0.05 I0.050 0.03 10.0009'10.00003 J I0.0050 <2 117 I Summer ND 14.6 17.95 7.04 22 0.014 2.62 I0.130 0.10 10.0014'I 0.0002' I0.0139 4.6 147 I Winter ND 10.4 8.66 7.06 25 0.012 3.13 0.123 0.09 0.0019' 0.0002' 0.0176 3.5 1 40 I J-Estimated concentration City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 10 Table 6. Summary of Selected Stream Monitoring Data, FY1819 and FY1213-FY1617 (continued) `u E bA E Z _ Z o\o a tiD oA dp -L. J O1 E _ C �+ J J J pp bA v ° a�i Q w - M En) a 3 s c E s +� ao Z 2 O u a N v v 03 p T a Z Z r a +� > o 0 2 H H H Ball Creek at Temple Maximum 6.8 16.9 12.24 7.96 >2420 0.030 1.03 0.138 0.10 0.0060 0.0011 0.0420 28.0 39 Geomean 0.7 10.7 10.45 7.65 176 0.004' 0.62 0.078 0.07 0.0019' 0.0001' 0.0213 2.5 25 Minimum 0.3 5.2 1 8.66 7.22 17 <0.0012 0.34 0.044 0.04 0.0002' <0.0000067 0.0100 <2 <10 Summer 0.4 14.5 9.46 7.65 416 0.007' 0.69 0.099 0.09 0.0042 0.0003' 0.0301 3.3 34 Winter 1.1 8.6 11.05 7.65 95 0.003' 0.58 0.065 0.06 0.0011' 0.00005' 0.0166 2.0 20 I Historical Maximum ND 17.7 14.72 8.53 >2419 0.100 3.00 0.930 0.21 0.0140 0.0025 0.0570 72.5 69 GeoMean ND 11.8 9.65 7.77 135 0.018 0.73 0.101 0.07 0.0021 0.0004' 0.0140 4.4 34 Minimum ND 5.3 4.58 6.04 4 <0.0012 0.16 <0.01 0.03 0.0003' 0.0001' 0.0050 <2 <10 Summer ND 15.0 9.06 7.77 234 0.011 0.71 0.107 0.09 0.0022 0.0003.1 0.0145 3.8 36 Winter ND 9.7 10.53 7.75 105 0.011 0.73 0.085 0.05 0.0019' 0.0003' 0.0177 3.7 29 Carter Creek above Bangy Maximum 7.0 19.1 11.52 7.52 1203 0.080 0.83 0.173 0.06 0.0060 1 0.0006 0.0260 14.0 46 Geomean 0.9 10.4 8.02 7.20 93 0.051 0.26 0.101 0.03 0.0022 1 0.0001' 0.0110 4.5 31 I Minimum 0.2 4.8 5.01 6.41 3 0.040 0.08 10.051 0.02 10.0010'I<0.0000067 I0.0048 2.5 11 I Summer 0.5 16.2 6.00 7.09 243 0.061 0.15 0.148 0.05 0.0025 0.0001" 0.0076 5.9 37 Winter 1.3 8.1 9.09 7.28 47 0.045 0.38 0.077 0.03 0.0020 0.0001' 0.0144 3.7 27 Historical Maximum ND 21.0 12.95 12.20 >2420 0.540 2.00 0.650 0.25 0.0071 0.0020' 0.0490 37.5 140 GeoMean ND 12.2 7.14 7.54 120 0.040 0.40 0.102 0.06 0.0018' 0.0003' 0.0106 3.7 39 Minimum ND 4.4 2.79 6.94 10 <0.0012 0.06 0.025 0.03 0.0009' 0.00004' 0.0043 <2 13 Summer ND 17.2 5.64 7.42 201 0.042 0.22 0.145 0.08 0.0020 0.0002' 0.0086 4.6 40 Winter ND 9.3 8.91 7.52 85 0.042 0.52 0.082 0.04 0.0019' 0.0002' 0.0140 3.6 35 Nettle Creek above Tryon Creek Maximum 2.9 17.0 13.41 7.89 >2420 0.050 1.40 0.149 0.09 0.0041 0.0004' 0.0220 10.5 66 Geomean 0.4 9.0 10.57 7.44 205 0.011 0.74 0.074 0.04 0.0015' 0.0001' 0.0078 3.0 31 Minimum 0.1 4.2 5.86 6.86 9 <0.0012 0.37 0.041 0.02 10.0005'10.00003' 10.0045 <2 16 I Summer 0.1 13.9 8.47 7.41 362 0.020 0.62 0.108 0.06 0.0020 0.0002" 0.0111 5.1 40 Winter 1.0 6.9 12.05 7.47 491 0.016 0.93 0.059 0.04 0.0015' 0.0001' 0.0066 2.6 26 Historical Maximum ND 16.9 16.21 8.62 >2419 1.500 1.70 1.330 0.25 0.0390 0.0210 0.2120 848.0 110 GeoMean ND 10.3 10.11 7.69 152 0.035 0.90 0.101 0.08 0.0016' 0.0004' 0.0087 6.2 1 35 I Minimum ND 2.8 4.70 6.41 11 <0.0012 0.31 10.010 0.04 10.0007'10.00003' 10.0036 <2 I<10 I Summer ND 14.6 8.80 7.68 210 0.019 0.71 0.103 0.08 0.0014' 0.0002" 0.0063 6.3 38 Winter ND 7.8 11.40 7.61 164 0.021 1.00 0.089 0.06 0.0017' 0.0003' 0.0100 4.5 33 J-Estimated Concentration;Historical=FY1213 to FY1617 City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 11 4.3 Wet Weather Monitoring Each year,the City collects stormwater samples from two sites during rain events that provide at least 0.1 inches of precipitation. Samples are analyzed for the same parameters as the regular monthly sampling. Detailed water quality data associated with the monitoring effort is available in Appendix A. Reese Road is an urban area with many commercial businesses. It receives runoff from Boones Ferry Rd which is a major arterial street in the City. South Shore is primarily residential with schools, Luscher Farms, and a golf course in its watershed. With these differences in land use, it could be assumed that South Shore may have more input from nutrients whereas Reese Rd may have larger metal concentrations. As shown in Table 7,the maximum concentrations for many parameters at the Reese Rd and South Shore sites were reduced in FY1819 when compared to historical concentrations. The range for many of the parameters was also reduced which could mean a more stable environment or persistent sources. For South Shore,the geomean phosphorous concentration in FY1819 was reduced to below the historical minimum. The maximum concentration for total zinc was reduced below the average historical concentrations and the maximum concentrations for total lead and dissolved zinc saw a reduction similar to the average historical concentration. Interestingly, the nutrient data for South Shore, except for nitrate, was less than that of Reese Rd. The dissolved portion of total phosphorous for both sites is much less than the fraction found in the monthly monitoring. Additional attention to street sweeping in these areas and encouraging more vegetated stormwater facilities may reduce total suspended solids and have an effect on total phosphorous loads. A major capital improvement project on Boones Ferry Rd, currently under construction, includes several vegetated stormwater facilities using biochar; it is expected that phosphorous concentrations will be reduced by the project. 5 STORM WATER MANAGEMENT PLAN The City's Stormwater Management Plan contains the seven minimum measures required in the MS4 permit along with measureable goals and tracking measures to assess progress(See Appendix B). Progress towards meeting post-construction requirements was discussed in Section 3 and a summary of the progress for other measures is discussed in this section. Details are provide in Appendix B. 5.1 Illicit Discharge Detection and Elimination (IDDE) The IDDE program includes a spill response plan, spill and citizen complaint response, outfall monitoring, wastewater conversions from septic systems,and notifying DEQ of businesses in the city limits which may require an industrial stormwater permit(1200-Z). In FY1819,the City updated its Spill Response Plan with a requirement for annual training along with a map and list of its underground injection control facilities (UICs). There were no cross-connections discovered between the wastewater and stormwater systems. Because of staff changes, information regarding septic system conversions to the public wastewater system were not tracked. City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 12 Table 7. Summary of Wet Weather Sampling,FY1819 and FY1213-FY1617 m U a J O U \ \ J - Cr J a u > X .. E v ,� °+0 own u' ono a OaCo IN \ \ e J v -o Ja OA 3 E a 3 Q. v oo $ \ T ova m E z z a . 3 > Sao a > ova N > Sao E E E o Li B N c o f w a c E c 76 o m m m ra n ra H a H v`7i G U p 2 = m Z Z 12 ° C 3 3 G 0 I- ~ a I- I_ Reese Road FY1819 Maximum 0.012 12.7 412.4 7.7 10.2 >2420 16.2 38.3 16 1.02 0.63 0.467 0.21 0.0340 0.0150 0.0076 0.00055 0.232 0.149 150.0 204 97 546.0 Geomean 0.006 10.9 109.7 6.9 8.8 213 8.7 28.3 14 0.64 0.47 0.388 0.11 0.0281 0.0107 0.0058 0.00038i 0.204 0.102 96.2 99 75 210.9 Minimum 0.003 9.0 53.8 6.4 7.3 28 <5 23.9 12 0.26 0.34 0.273 0.04* 0.0250 0.0068 0.0037 0.00023J 0.161 0.059 52.0 66 59 125.0 Historical Maximum 14.4 420.9 7.8 11.9 >2420 19.1 100.7 59 0.98 0.42 0.850 6.63 0.0450 0.0150 0.0140 0.00060 0.291 0.107 550.0 155 180 506.0 Geomean 10.3 62.6 7.3 9.5 347 8.6 23.6 14 0.41 0.18 0.407 0.13 0.0217 0.0074 0.0051 0.00020i 0.158 0.062 87.5 70 69 85.0 Minimum 8.4 18.5 6.5 6.9 11 <5 9.0 4 0.16 0.04 0.206 0.01 0.0090 0.0030 0.0030 <0.000091 0.071 0.036 33.5 42 21 9.2 South Shore FY1819 Maximum 3.1 10.9 122.4 7.4 11.5 >2420 23.0 35.3 3 0.07 1.53 0.112 0.05 0.0120 0.0075 0.0009 0.00076 0.029 0.032 30.5 79 30 205.0 Geomean 1.4 9.7 78.1 7.0 10.6 567 19.0 28.1 <2 0.02 1.03 0.067 0.02 0.0072 0.0049 0.0006 <0.000091 0.026 0.022 12.6 64 19 32.9 Minimum 0.7 8.3 49.4 6.7 8.9 28 15.4 21.5 <2 0.01 0.53 0.049 0.01 0.0051 0.0029 0.0004J <0.000091 0.024 0.013 6.5 41 15 13.0 Historical Maximum 13.1 263.5 7.6 11.6 >2420 30.0 49.0 10 0.15 15.70 0.520 0.13 0.0430 0.0400 0.0020 0.00060 0.185 0.137 60.0 98 52 168.0 Geomean 10.3 99.9 7.2 10.1 905 24.0 32.5 3 0.05 1.39 0.187 0.05 0.0087 0.0054 0.0009 <0.000091 0.044 0.032 20.0 72 32 23.9 Minimum 7.6 49.8 6.4 9.0 37 19.0 18.4 <2 0.01 0.64 0.080 0.01 0.0038 0.0020 0.0003J <0.000091 0.018 0.010 3.4 41 21 4.4 *H1: Lab pH,hold time exceeded;J-Estimated Concentration; Historical=FY1213 to FY1617 City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 13 5.1.1 Spill Response and Enforcement The Lake Oswego Fire Department responded to 158 incidents, primarily auto accidents, of which 32 involved spills. Spills were primarily cleaned up with granular absorbent. Other staff responded to nine incidents involving an illicit discharge (see Table 8) with six receiving a citation. The majority of the incidents involved sediment or concrete washwater discharging to a catchbasin. Table 8. Spills and Illicit Discharge Investigations in Lake Oswego, FY1819 Date Watershed Type Action Citation 08/2018 Oswego Lake Concrete Discharge Clean Catch basins/Sweep Street Y 09/2018 Willamette River Paint/Grease Discharge Clean Catchbasins N 10/2018 Tualatin River SSO(OERS 2018-2436) Clean Catchbasin N 12/2018 Tryon Creek Sediment Discharge Install Erosion Controls N 12/2018 Tryon Creek Sediment Discharge Sweep Street/Clean Detention Ponds Y 12/2018 Willamette River Grease/Concrete Discharge Clean pavement/manhole N 12/2018 Springbrook Creek SSO(OERS 2018-2783) Cleanup sewage N 01/2019 Oswego Lake Sediment Discharge Clean Catch basins/Sweep Street Y 01/2019 Tryon Creek Sediment Discharge Install Erosion Controls Y 4/2019 Oswego Lake Sediment Discharge Clean Catch basins/Sweep Street Y 6/2019 Tualatin River Sediment Discharge Re-install Erosion Controls Y The City currently monitors three priority outfalls for illicit discharges during the dry season. These inspections continued in FY1819. No investigations were required as a result of inappropriate discharges from the designated outfalls. 5.1.2 Industrial and Commercial Facilities Industrial projects on Jean Rd and on Willow Lane were completed in FY1819. Both provide space for multiple tenants who may be potential sources of pollutant loading. The number of construction plans reviewed was not tracked in FY1819 due to staff changes. The City sent six notifications letters to industrial and commercial businesses that may be required to have a DEQ 1200-Z permit. DEQ was copied on all of the notification letters and the facilities were required to notify the City of DEQ's decision. Two of the businesses were not required to have a 1200-Z permit; the rest of the businesses have not responded with DEQ's decision. 5.2 Construction Site Runoff Control Construction site runoff control, or erosion and sediment control (ESC), is an important program for reducing total suspended solids in streams within the City's jurisdiction. The City currently has a 500 sq ft soil disturbance threshold for requiring an ESC permit. The City also requires an ESC permit for projects that are within 50ft of a lake or waterway. City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 14 The City issued 175 ESC permits in FY1819. Most were associated with a building permit; 28 were for capital improvement projects, public improvement projects, or flatwork not associated with a building permit. Initial ESC inspections were conducted at 117 projects. There were 131 intermediate ESC inspections and 191 final ESC inspections. More than three inspections were conducted at 27 projects. Eight citations were issued as part of the ESC program. Most of the citations were caused by a failure to install or maintain the ESCs. 5.3 Public Education and Outreach The City is a member of several regional stormwater outreach groups such as Regional Coalition of Clean Rivers and Streams (RCCRS), the state-wide Clean Rivers and Streams (CRS), the Tualatin Basin Public Awareness Committee (TBPAC), and a group that works with KOIN-TV to provide public service announcements (PSAs). In addition, staff provide stormwater education and outreach through its social media(Facebook,Twitter,and Instagram),a newsletter,calendar,water audits,and a stormdrain marking program. As part of our regional partnership with KOIN-TV, there were Public Service Announcements (PSAs) for proper disposal of automotive fluids, proper leaf disposal and removal of leaves from catchbasin grates, proper fertilizer applications, proper disposal of RV waste, draining of hot tubs, and pressure washing. Approximately 40 PSAs were broadcast each month which reached an average of 780,000 people through the KOIN-TV website, Facebook page, and PSAs. In FY1819, 222 markers were placed throughout the City. During FY1819, staff provided water conservation audits for 59 residential and 2 commercial properties. During the audits, owners are educated about landscape management in regard to proper storage, use, and keeping materials out of the street. In addition,the City provided information on proper fertilizer application and its Drug TakeBack events through its newsletters and its social media. Through the City's regional partnership for PSAs with KOIN-TV, the public was educated on practices for car washing and on proper fertilizer and pesticide application over 6 months. The 40 PSAs were broadcast for six month and reached an average of 610,000 people each month. 5.4 Public Involvement and Outreach A plastic bag ban was passed in FY1819 by the City Council. As part of the public involvement and education associated with that ordinance,the City provided information on plastic recycling,a showing of the documentary"Bag It", and plastic alternatives. The City holds two Drug TakeBack events each year. The event is publicized through its newsletters, Dog calendar,Twitter, and Facebook. Manuals, permits, annual reports, and other stormwater-related documents are available to the public through the City's website. There were no comments on these materials in FY1819. 5.5 Pollution Prevention for Municipal Operations The MS4 permit requires the City to inspect and maintain its stormwater infrastructure including repairing or replacing non-functioning components. In addition, the City provides information on pesticide applications at City facilities, including parks, and on its street sweeping and winter maintenance programs. City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 15 5.5.1 Stormwater Infrastructure The City's stormwater system contains over 130 miles of stormline, approximately 800 ditches, and over 4,000 catchbasins. Staff cleaned and inspected almost 1,500 catchbasins, 116 manholes, and over 1,000 ft of stormline. 5.5.2 Wastewater Infrastructure Effects As part of its Inflow and Infiltration program, the city has been inspecting its wastewater lines to determine if repairs or maintenance is needed to reduce infiltration into the lines and exfiltration to stormwater lines. In FY1819,the City spent approximately$83,000 to repair a section of wastewater line. 5.5.3 Street Sweeping and Winter Maintenance Street sweeping is used to reduce total suspended solids, bacteria, nutrients, and metals in stormwater. In general, commercial streets are swept every week while major commuter routes are swept once a month. Curbed residential areas are swept four to six times a year. In FY1819, over 1,200 cu yd of debris was removed from the streets (0.31 cu yd per curb mile). The City's canopy coverage exceeds 80% and, as such, the fall season presents challenges in regard to flooding caused by leaves blocking inlets and catchbasin grates. The public is encouraged to properly dispose of leaves in yard debris bins provided by their trash collection service and is reminded by posts in the City's social media and in newsletter articles. In FY1819, two neighborhoods took advantage of the City's offer to provide dropoff boxes for leaf collection. Regional stormwater groups, of which the City is a member, also provide public service announcements and social media posts reminding people to uncover their storm drains to prevent flooding. In FY1819, staff removed 1,952 cu yds of leaf debris. Elevations in the City range from sea level along the Willamette River to approximately 1,000 ft in the northern section (Nansen Summit) to 98 at Oswego Lake in the middle of the City to over 700 ft in the southern section (Cook's Butte and Crestline Drive). These elevation changes can create challenging public safety situations when winter weather occurs in the region. The City uses gravel and magnesium chloride to increase safety on the streets when ice and/or snow are forecast. In FY1819, the City used 6,500 gallons of an anti-icer containing magnesium chloride (Freeze Guard Plus). 5.5.4 Pesticide Applications The City uses pesticides along the Willamette Trolley line, in City parks and natural areas, and in street medians. As shown in Table 9, the primary pesticides used were an herbicide containing glyphosate and a fungicide containing propiconazole. Staff and contractors are certified in pesticide application. In FY1819, pesticide training was provided for 17 staff and contractors. 5.6 Stormwater Facility Management The City inspects and maintains public stormwater facilities. In addition, it also requires that private stormwater facilities remain functional through periodic inspection and maintenance. Staff add public stormwater facilities to the GIS (LO Maps) when as-builts are submitted at project completion. Private facilities are added when developers submit site plans and/or as-builts. 5.6.1 Public Stormwater Facilities Staff maintained two bioswales in FY1819. Maintenance on the remaining facilities in FY1819 was not tracked by facility. City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 16 Table 9. Pesticides Used on City Property, FY1819 Pesticide Name Active Ingredients Gal Lbs 2,4-D(28.57%); Mecoprop-p acid (5.88%); Dicamba acid (1.71%); and Speedzone Carfentrazone-ethyl (0.62%) 1.9 1.3 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3- Imazapyr pyridinecarboxylic acid). 0.1 Transline Clopyralid 0.7 Secure Fluazinam 0.5 Sureguard Flumioxazin 1.7 Cheetah Pro Glufosinate ammonium 0.3 Rodeo Glyphosate 70.4 MSM 60 DF Metsulfuron-methyl (60%)and ammonium sulfate(17%) 2.9 Turfcide Pentochloronitrobenzene 150.0 Affirm Polyoxin D zinc salt 3.6 Prophecy Propiconazole 200.0 Instrata Propiconazole(4.7%)and fluidoxinol (1.2%) 5.0 Landmark XP Sulfometuron methyl (50%)and Chlorsulfuron (25%) 0.7 5.9 SFM 75 Sulfometuron methyl 1.0 Garton 3A Triclopyr 31.9 Snapshot Trifluralin 12.5 Milestone 2-pyridine carboxylic acid,4-amino-3,6-dichloro-2-pyridinecarboxylic acid 1.9 Total 113.3 378.9 5.6.2 Private Stormwater Facilities The City has historically inspected private stormwater facilities on a complaint-driven basis. In FY1819, the City updated its policies and procedures to provide a uniform approach to the program. The update is currently under internal review. No older private stormwater facilities were inspected in FY1819. Currently, new private stormwater facilities are inspected at the final ESC inspection to ensure that they are built according to the approved construction plans. Before project completion, the City requires a stormwater maintenance agreement recorded against the property deed, evidence of UIC registration (if appropriate), an as-built or site plan, and a stamped certification by the professional who designed the stormwater facility. 6 ADAPTIVE MANAGEMENT Adaptive management is required as part of the MS4 permit and is defined in the permit as a method for refining and improving stormwater programs. Adding, reducing, replacing, or eliminating any best management practice is considered a permit revision and must undergo review and approval by DEQ. The City proposes no changes to its SWMP or BMP requirements. City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 17 This page intentionally left blank City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 18 APPENDIX A LAKE OSWEGO MONITORING DATA Abbreviations BOD5 5-Day Biological Oxygen Demand Ca Calcium CL2 Chloride Cu Copper DOC Dissolved Organic Carbon Mg Magnesium K Potassium Na Sodium NH3 Ammonia NO3 Nitrate P Phosphorous Pb Lead PO4 Orthophosphate SO4 Sulfate TDS Total Dissolved Solids TOC Total Organic Carbon TSS Total Suspended Solids TVS Total Volatile Solids Zn Zinc City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 19 This page intentionally left blank City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 20 TABLE A.1. NETTLE CREEK ABV TRYON CREEK,INSTREAM MONITORING RESULTS, FY1819 Staff Water Specific E.coli Alkalinity Hardness, NH3, NO3, PO4,as Total Total Q Gauge, Temp DO Conduct (MPN/ as CaCO3 as CaCO3 CL2 Ca Mg K Na SO4 BOD5 as N as N Total P P Cu Diss Cu Total Pb Diss Pb Zn Diss Zn TSS" TDS TVS Turbidity TOC DOC DATE (cfs) ft (°C) (mg/L) (µS/cm) pH 100mL) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (NTU) (mg/L) (mg/L) 07/11/18 9:20 0.1 NA 15.4 9.18 172.4 7.47 179 65.4 66.5 8.9 17.0 5.84 1.58 9.2 7.6 <2 0.02 0.65 0.095 0.06 0.0011' 0.0008 J 0.0002 J <0.00008 0.0061 0.0044 3.0 133 37 7.44 2.65 2.72 08/15/18 8:55 0.1 NA 17.0 5.86 240.7 7.24 160 NS 79.5 NS NS NS NS NS NS <2 0.01 0.37 0.149 0.09 0.0020 0.0020 0.0003J <0.00008 0.0140 0.0160 10.5 171 37 12.10 NS NS 09/13/18 10:30 0.2 NA 13.3 NS 144.0 6.86H1 >2420 NS 48.6 NS NS NS NS NS NS 3.0 0.05 0.81 0.131 0.07 0.0040 0.0040 0.0004J 0.0001'J 0.0220 0.0260 5.0 115 66 17.30 NS NS 10/16/18 9:40 0.2 NA 10.6 9.73 187.7 7.31 127 63.5 65.6 10.2 17.3 5.44 2.34 9.4 11.8 <2 0.01 0.38 0.095 0.07 0.0041 0.0012 J 0.0003' <0.00008 0.0052 0.0093 <2 131 16 6.27 3.26 3.27 11/13/18 8:55 0.4 NA 5.5 12.34 179.9 7.31 9 NS 64.5 NS NS NS NS NS NS <2 <0.0012 0.46 0.058 0.04 0.0009J 0.0008J 0.0001J 0.00003' 0.0052 0.0120 6.0 119 29 5.05 NS NS 12/21/18 9:15 1.1 NA 6.7 12.59 151.9 7.23 579 NS 55.6 NS NS NS NS NS NS <2 0.03 1.40 0.053 0.04 0.0012J 0.0013J <0.0000553<0.000091 0.0072 0.0130 <2 119 27 6.64 NS NS 01/15/19 10:00 0.7 NA 4.2 13.23 158.4 7.03 142 NS 52.8 NS NS NS NS NS NS <2 0.01 1.07 0.041 0.03 0.0013J 0.0012J 0.00004' <0.000091 0.0054 0.0130 <2 117 25 4.32 NS NS 02/14/19 8:30 2.9 NA 6.0 12.07 141.0 7.75 125 NS 54.0 NS NS NS NS NS NS <2 0.02 1.20 0.074 0.03 0.0005 J 0.0021 0.0003 J <0.000091 0.0140 0.0190 4.0 105 41 10.20 NS NS 03/14/19 10:30 0.8 NA 5.6 13.41 150.8 7.89 32 42.6 51.6 8.8 13.4 4.40 1.37 8.6 12.0 <2 <0.0012 0.99 0.042 0.02 0.0011 0.0009J 0.0001' <0.000091 0.0049 0.0180 2.5 108 21 4.61 1.77 1.66 04/18/19 8:40 0.7 NA 9.6 11.01 153.7 7.79 >2420 NS 52.7 NS NS NS NS NS NS <2 0.04 1.02 0.051 0.03 0.0011' 0.0009J 0.0001' <0.000091 0.0045 0.0029 2.5 109 25 7.87 NS NS 05/15/19 8:00 0.4 NA 11.7 9.90 182.7 7.72 308 55.6 56.1 11.0 14.7 4.71 1.43 9.1 12.0 <2 0.03 0.74 0.082 0.05 0.0031 0.001' 0.0001' 0.00003' 0.0120 0.0057 2.5 145 39 6.09 2.50 2.44 06/20/19 8:10 0.1 NA 12.8 9.68 176.5 7.82 291 NS 63.2 NS NS NS NS NS NS <2 0.01 0.62 0.098 0.05 0.0012' 0.0008J 0.0003J 0.00005' 0.0074 0.0042 9.0 136 30 13.20 NS NS FY1819 MAXIMUM 2.9 NA 17.0 13.41 240.7 7.89 >2420 65.4 79.5 11.0 17.3 5.84 2.34 9.4 12.0 3.0 0.05 1.40 0.149 0.09 0.0041 0.0040 0.0004 0.00010 0.0220 0.0260 10.5 171 66 17.30 3.26 3.27 GEOMEAN 0.4 NA 9.0 10.57 168.2 7.44 205 56.0 58.7 9.7 15.5 5.07 1.64 9.1 10.7 <2 0.01 0.74 0.074 0.04 0.0015' 0.0012' 0.0001 0.00004 0.0078 0.0098 3.0 124 31 7.68 2.49 2.45 MINIMUM 0.1 NA 4.2 5.86 141.0 6.86 9 42.6 48.6 8.8 13.4 4.40 1.37 8.6 7.6 <2 <0.0012 0.37 0.041 0.02 0.0005' 0.0008' 0.0000 0.00003 0.0045 0.0029 <2 105 16 4.32 1.77 1.66 SUMMER 0.1 NA 13.9 8.47 180.7 7.41 362 60.3 61.9 9.9 15.8 5.24 1.50 9.1 9.5 <2 0.02 0.62 0.108 0.06 0.0020 0.0014' 0.0002 0.00005 0.0111 0.0085 5.1 139 40 10.46 2.57 2.58 WINTER 1.0 NA 6.9 12.05 160.5 7.47 491 53.1 56.7 9.5 15.4 4.92 1.86 9.0 11.9 <2 0.02 0.93 0.059 0.04 0.0015' 0.0012' 0.0001 0.00004 0.0066 0.0125 2.6 115 26 6.42 2.52 2.47 HISTORICAL(FY1213 TO FY1617) MAXIMUM ND NA 16.9 16.21 230.0 8.62 2419 79.0 84.1 8.6 19.0 6.40 2.10 10.0 14.0 3.0 1.50 1.70 1.330 0.25 0.0390 0.0093 0.0210 0.00053 0.2120 0.0400 848.0 160 110 685.00 4.45 4.30 GEOMEAN ND NA 10.3 10.11 143.9 7.69 152 44.2 56.5 5.7 14.8 4.61 1.85 7.3 8.1 <2 0.04 0.90 0.101 0.08 0.0016i 0.0012i 0.0004 0.00016 0.0087 0.0060 6.2 117 35 6.55 3.54 3.43 MINIMUM ND NA 2.8 4.70 48.1 6.41 11 2.2 39.0 1.4 11.1 3.15 1.60 2.3 3.4 <2 <0.0012 0.31 0.010 0.04 0.0007' 0.0007' 0.0000 0.00000 0.0036 0.0024' <2 49 <10 1.14 2.42 2.22 SUMMER ND NA 14.6 8.80 170.6 7.68 210 61.8 64.4 10.0 17.0 5.43 1.74 9.8 8.5 <2 0.02 0.71 0.103 0.08 0.0014' 0.0012i 0.0002 0.00007 0.0063 0.0051 6.3 134 38 6.22 3.07 3.08 WINTER ND NA 7.8 11.40 136.5 7.61 164 36.7 52.0 6.2 13.2 3.87 1.99 6.8 10.0 <2 0.02 1.00 0.089 0.06 0.0017J 0.0012' 0.0003 0.00013 0.0100 0.0073 4.5 110 33 7.33 2.83 2.75 Notes: J-Estimated result(between the method reporting limit and method detection limit); H1-Hold time exceeded; NN-Parameter not accredited under NELAP for the analytical method used; ND-No Data; NA-Not Applicable;NS-Not Sampled;<,> -Result at method reporting limit shown City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 21 TABLE A.2 LOST DOG CREEK AT LAKE FRONT RD,INSTREAM MONITORING RESULTS, FY1819 Staff Water Specific E.coli Alkalinity Hardness, NH3, NO3, PO4, Total Total Q Gauge, Temp DO Conduct (MPN/ as CaCO3 as CaCO3 CL2 Ca Mg K Na 504 BODS as N as N Total P as P Cu Diss Cu Total Pb Diss Pb Zn Diss Zn TSSNN TDS TVS Turbidity TOC DOC DATE (cfs) ft (°C) (mg/L) (µS/cm) pH 100mL) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (NTU) (mg/L) (mg/L) 07/11/18 10:15 0.1 0.2 16.3 8.6 133.7 7.28 133 45.0 48.2 5.0 13.1 3.8 1.4 5.8 7.7 <2 0.01 0.64 0.091 0.08 0.0022 0.0024 0.0001 <0.00008 0.012 0.008 <2 100 21 2.85 2.53 2.92 08/15/18 9:40 0.1 0.1 18.2 7.1 159.3 7.28 42 NS 57.9 NS NS NS NS NS NS <2 <0.0012 0.27 0.097 0.10 0.0030 0.0020 0.0001' <0.00008 0.019 0.017 5.0 117 25 5.19 NS NS 09/13/18 11:50 0.2 NR 14.8 NS 141.5 6.90H1 649 NS 55.9 NS NS NS NS NS NS 2.0 0.02 0.36 0.171 0.08 0.0070 0.0060 0.0002' 0.00007 0.027 0.031 5.0 128 43 8.96 NS NS 10/16/18 10:35 <0.1 <0.1 11.9 7.3 123.2 6.99 64 43.6 44.8 4.4 12.3 3.4 1.8 5.5 8.8 <2 <0.0012 0.45 0.087 0.08 0.0024 0.0020 0.0002' <0.00008 0.019 0.018 <2 93 38 2.35 2.59 2.52 11/13/18 9:40 0.1 0.1 7.0 11.4 126.2 7.31 22 NS 46.0 NS NS NS NS NS NS <2 <0.0012 0.49 0.058 0.06 0.0016' 0.0015' 0.0002' <0.000022 0.010 0.022 <2 91 37 2.44 NS NS 12/20/18 10:00 1.9 0.3 10.4 11.3 115.5 7.14 517 NS 43.4 NS NS NS NS NS NS <2 0.01 1.37 0.063 0.03 0.0027 0.0019' 0.0003' <0.000091 0.029 0.032 4.5 92 27 13.30 NS NS 01/15/19 10:45 0.7 0.2 4.9 12.7 111.6 7.23 33 NS 37.4 NS NS NS NS NS NS <2 0.01 1.03 0.028 0.03 0.0017' 0.0020 0.0001' 0.00009 0.023 0.029 <2 85 30 5.01 NS NS 02/14/19 9:25 0.6 0.4 6.4 12.0 94.7 7.75 86 NS 34.5 NS NS NS NS NS NS <2 0.03 1.10 0.057 0.02 0.0002 0.0013' 0.0002 <0.000091 0.022 0.022 3.5 77 30 10.60 NS NS 03/14/19 11:30 1.4 0.2 6.3 13.0 103.3 7.79 14 31.5 40.2 5.1 10.9 3.2 0.9 5.7 8.5 <2 0.02 0.83 0.068 0.02 I0.0013' 0.001' 0.0001' <0.000091 0.013 0.021 3.0 83 36 3.95 1.54 1.53 04/18/19 9:30 1.3 0.2 10.5 11.4 110.3 7.82 21 NS 39.8 NS NS NS NS NS NS <2 0.01 0.77 0.047 0.02 0.0015' 0.0012' 0.0001' <0.000091 0.016 0.010 <2 81 34 4.91 NS NS 05/15/19 9:15 0.3 0.2 12.9 9.8 119.8 7.67 54 41.5 39.2 5.1 10.7 3.0 1.1 5.2 6.2 <2 0.03 0.34 0.074 0.05 0.0027 0.0014' 0.0001' <0.000022 0.017 0.010 2.5 99 22 4.22 2.42 2.40 06/20/19 9:00 0.1 0.1 13.8 8.3 118.3 7.66 41 NS 43.5 NS NS NS NS NS NS <2 <0.0012 0.60 0.081 0.07 0.0017' 0.0014' 0.0001' <0.000022 0.012 0.009 <2 75 24 4.73 NS NS FY1819 MAXIMUM 1.9 0.4 18.2 13.02 159.3 7.82 649 45.0 57.9 5.1 13.1 3.8 1.8 5.8 8.8 2.0 0.03 1.37 0.171 0.10 0.0070 0.0060 0.0003 0.00009 0.029 0.032 5.0 128 43 13.30 2.59 2.92 GEOMEAN 0.3 0.1 10.3 10.04 120.4 7.40 64 40.0 43.7 4.9 11.7 3.3 1.2 5.5 7.7 <2 0.01 0.61 0.070 0.05 0.0018' 0.0018' 0.0001 0.00003 0.017 0.017 <2 92 30 4.93 2.22 2.28 MINIMUM <0.1 <0.1 4.9 7.07 94.7 6.90 14 31.5 34.5 4.4 10.7 3.0 0.9 5.2 6.2 <2 <0.0012 0.27 0.028 0.02 0.0002' 0.0010' 0.0001 0.00001 0.010 0.008 <2 75 21 2.35 1.54 1.53 SUMMER 0.2 0.1 15.5 8.6 135.0 7.35 75 43.2 49.7 5.0 11.8 3.4 1.2 5.5 6.9 <2 0.003 0.44 0.093 0.07 0.0028 0.0022 0.0001 0.00003 0.015 0.014 2.2 102 26 4.51 2.47 2.65 WINTER 0.5 0.1 7.8 11.1 111.6 7.43 48 37.1 40.7 4.7 11.6 3.3 1.3 5.6 8.6 <2 0.01 0.80 0.055 0.03 0.0013' 0.0015' 0.0001 0.00004 0.018 0.021 <2 86 33 5.00 2.00 1.96 HISTORICAL(FY1213 TO FY1617) MAXIMUM ND ND 20.6 16.17 189.4 8.57 1203 89.0 100.0 7.8 16.0 4.6 1.9 8.8 12.0 2.80 0.66 2.30 1.600 0.31 0.0330 0.0074 0.0015 0.00150 0.176 0.170 48.0 180 54 89.20 4.10 4.40 GEOMEAN ND ND 11.4 9.33 121.3 7.68 75 39.1 46.4 5.3 12.7 3.5 1.5 6.6 7.3 <2 0.02 0.70 0.080 0.05 0.0020 0.0017' 0.0003 0.00014 0.016 0.013 2.6 95 27 3.31 3.01 3.03 MINIMUM ND ND 3.3 4.43 49.8 6.79 <1 13.4 23.8 2.3 6.7 1.7 1.2 4.1 4.9 <2 <0.0012 0.03 0.025 0.01 0.0009' 0.0008' 0.0000 <0.000022 0.005 0.005 <2 62 <10 0.91 2.20 2.00 SUMMER ND ND 16.2 7.79 139.8 7.55 49 50.5 44.2 6.1 13.8 3.9 1.5 6.1 7.2 <2 0.01 0.42 0.097 0.06 0.0025 0.0021 0.0001 0.00008 0.013 0.012 2.0 105 27 2.39 3.05 3.12 WINTER ND ND 8.6 11.04 109.5 7.63 97 33.0 41.2 4.5 10.8 3.1 1.2 6.2 8.2 <2 0.02 0.99 0.065 0.04 0.0019' 0.0015' 0.0003 0.00011 0.018 0.014 2.8 88 28 4.91 2.27 2.25 Notes: J-Estimated result(between the method reporting limit and method detection limit);H1-Hold time exceeded;NN-Parameter not accredited under NELAP for the analytical method used; ND-No Data; NA-Not Applicable; NS-Not Sampled;<,> -Result at method reporting limit shown City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 22 Table A.3 Springbrook Creek at Iron Mountain Blvd,Instream Monitoring Results,FY1819 Staff Water Specific E.coli Alkalinity Hardness, NH3, NO3, PO4, Total Q Gauge, Temp DO Conduct (MPN/ as CaCO3 as CaCO3 CL2 Ca Mg K Na 504 BODS as N as N Total P as P Cu Diss Cu Total Pb Diss Pb Total Zn Diss Zn TSSNN TDS TVS Turbidity TOC DOC Date (cfs) ft (°C) (mg/L) (µS/cm) pH 100mL) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (NTU) (mg/L) (mg/L) 07/11/18 11:45 2.5 0.91 14.6 7.1 141.9 6.4 66 48.7 49.5 6.0 12.0 4.8 1.8 6.7 7.2 <2 0.08 0.68 0.107 0.08 0.0006' 0.0005' 0.00007' <0.00008 0.004 0.003 <2 112 23 3.57 0.94 1.33 07/11/18 11:46 NR NR NR NR NR NR 77 48.6 49.1 6.0 11.9 4.7 1.8 6.7 7.1 <2 0.02 0.69 0.111 0.08 0.0006'0.0006' 0.00005' <0.00008 0.005 0.003 2.5 112 27 NR 0.91 1.23 08/15/18 10:45 2.4 0.92 16.0 6.9 145.9 6.3 61 NS 53.1 NS NS NS NS NS NS <2 0.01 0.62 0.098 0.10 0.0010'0.0010' 0.0001' <0.00008 0.010 0.018 <2 109 18 4.44 NS NS 08/15/18 10:46 NR NR NR NR NR NR 160 NS 52.7 NS NS NS NS NS NS <2 0.01 0.62 0.097 0.10 0.0009'0.0010' 0.0001' <0.00008 0.011 0.020 <2 111 27 NR NS NS 09/13/18 12:35 2.4 0.96 14.8 NS 133.6 7.0H1 >2420 NS 50.6 NS NS NS NS NS NS <2 0.02 0.52 0.093 0.08 0.0030 0.0030 0.0002' 0.00006' 0.015 0.029 2.5 113 33 9.71 NS NS 09/13/18 12:36 NR NR NR NR NR NR >2420 NS 48.2 NS NS NS NS NS NS <2 0.02 0.52 0.093 0.08 0.0030 0.0040 0.0002' 0.00006' 0.015 0.022 3.5 115 32 NR NS NS 10/16/18 11:50 2.2 0.92 13.1 7.9 144.7 6.4 32 54.0 50.7 5.8 12.3 4.9 2.4 7.4 7.7 <2 0.01 0.56 0.099 0.09 0.0008'0.0006' 0.00004' <0.00008 0.007 0.009 2.0 111 <10 2.87 0.87 0.97 10/16/18 11:51 NR NR NR NR NR NR 28 53.8 52.7 5.8 12.8 5.0 2.4 7.6 7.7 <2 0.01 0.56 0.095 0.09 0.0008' 0.0021 0.000017' 0.00009' 0.005 0.014 <2 119 40 NR 0.94 0.94 11/13/18 10:30 3.4 0.98 9.9 7.7 168.7 6.8 26 NS 62.6 NS NS NS NS NS NS <2 0.01 0.62 0.100 0.08 0.0008' 0.0080 0.00008' <0.000022 0.003 0.010 3.0 126 46 3.47 NS NS 11/13/18 10:31 NR NR NR NR NR NR 34 NS 65.1 NS NS NS NS NS NS <2 0.01 0.63 0.096 0.07 0.0110 0.0005' 0.00027' <0.000022 0.010 0.009 3.0 125 48 NR NS NS 12/20/18 11:50 10.9 1.35 10.6 10.9 108.4 6.6 411 NS 41.4 NS NS NS NS NS NS <2 0.03 0.85 0.110 0.06 0.0047 0.0024 0.0009 <0.000091 0.037 0.025 20.5 93 27 34.70 NS NS 12/20/18 11:51 NR NR NR NR NR NR 517 NS 42.1 NS NS NS NS NS NS <2 0.02 0.83 0.116 0.06 0.0048 0.0024 0.00092 <0.000091 0.037 0.024 20.5 91 27 NR NS NS 01/15/19 11:45 3.7 1.02 7.2 10.7 136.3 6.7 91 NS 47.4 NS NS NS NS NS NS <2 0.03 0.92 0.073 0.06 0.0005'0.0007' 0.00012' <0.000091 0.007 0.026 <2 108 21 3.98 NS NS 01/15/19 11:46 NR NR NR NR NR NR 58 NS 47.4 NS NS NS NS NS NS <2 0.02 0.94 0.071 0.06 0.0006'0.0007' 0.00008' <0.000091 0.008 0.025 2.0 106 29 NR NS NS 02/14/19 10:30 12.8 1.33 6.3 11.6 114.3 7.3 548 NS 36.6 NS NS NS NS NS NS <2 0.03 0.58 0.163 0.06 0.0085 0.0048 0.00290 0.00014 0.080 0.035 39.0 91 45 75.30 NS NS 02/14/19 10:31 NR NR NR NR NR NR 5448 NS 35.9 NS NS NS NS NS NS <2 0.02 0.57 0.159 0.06 0.0081 0.0022 0.00270 0.00011' 0.078 0.032 40.0 87 40 NR NS NS 03/14/19 12:55 2.5 1.08 8.5 12.3 151.4 7.1 37 44.3 57.6 10.0 14.3 5.3 2.0 7.8 8.4 <2 0.01 0.81 0.167 0.05 0.0011'0.0008' 0.00018' <0.000091 0.007 0.031 3.0 114 36 5.86 1.78 1.78 03/14/19 12:56 NR NR NR NR NR NR 59 44.2 54.7 10.0 13.6 5.0 1.9 7.4 8.3 <2 0.01 0.81 0.085 0.05 0.0010'0.0009' 0.00014' <0.000091 0.006 0.012 3.0 113 26 NR 1.78 1.76 04/18/19 10:30 3.1 1.10 11.3 10.4 145.3 7.0 345 NS 51.9 NS NS NS NS NS NS <2 0.01 0.19 0.078 0.05 0.0011'0.0008' 0.00006' <0.000091 0.005 0.004 2.0 142 30 5.54 NS NS 04/18/19 10:31 NR NR NR NR NR NR 365 NS 52.8 NS NS NS NS NS NS <2 0.01 0.87 0.076 0.05 0.001' 0.0009' 0.00007' <0.000091 0.005 0.004 3.0 114 32 NR NS NS 05/15/19 10:15 2.0 0.80 12.3 7.5 161.3 6.7 >2420 50.3 51.7 7.4 12.8 4.8 2.1 6.9 8.6 <2 0.03 1.03 0.106 0.08 0.0027 0.0016' 0.0001' 0.00006 0.009 0.006 5.5 121 32 5.74 2.68 2.56 05/15/19 10:16 NR NR NR NR NR NR >2420 49.6 48.2 7.4 11.9 4.5 2.0 6.5 8.7 <2 0.06 1.03 0.108 0.08 0.0018'0.0016' 0.00009' 0.00005' 0.009 0.006 5.5 124 31 NR 2.68 2.51 06/20/19 9:45 1.8 0.93 13.0 7.7 159.1 6.7 219 NS 57.7 NS NS NS NS NS NS <2 0.02 0.87 0.108 0.08 0.0009'0.0007' 0.00006' <0.000022 0.004 0.005 2.5 123 28 4.23 NS NS 06/20/19 9:46 NR NR NR NR NR NR 261 NS 54.7 NS NS NS NS NS NS <2 0.02 0.88 0.108 0.07 0.0009'0.0007' 0.00006' <0.000022 0.005 0.005 2.5 125 32 NR NS NS FY1819 MAXIMUM 12.8 1.35 16.0 12.30 168.7 7.33 2420 53.9 63.9 10.0 14.0 5.2 2.4 7.6 8.7 <2 0.05 1.03 0.161 0.100 0.0083 0.0043 0.0028 0.00013 0.0790 0.0335 39.5 128 47 75.30 2.68 2.54 GEOMEAN 3.3 1.01 11.0 8.94 141.5 6.73 196 49.1 50.1 7.1 12.7 4.9 2.0 7.1 7.9 <2 0.02 0.70 0.103 0.070 0.0016'0.0014' 0.0001 <0.00008 0.0097 0.0120 3.5 112 30 6.94 1.41 1.53 MINIMUM 1.8 0.80 6.3 6.85 108.4 6.27 30 44.3 36.3 5.8 12.0 4.6 1.8 6.7 7.2 <2 0.01 0.52 0.072 0.050 0.0006'0.0006' 0.0000 <0.000022 0.0044 0.0032 <2 89 23 2.87 0.91 0.96 SUMMER 2.2 0.90 14.1 7.27 148.0 6.59 407 49.3 51.5 6.7 12.1 4.7 1.9 6.7 7.9 <2 0.02 0.72 0.103 0.083 0.0013'0.0012' 0.0001 <0.00008 0.0077 0.0087 2.4 116 28 5.18 1.57 1.80 WINTER 4.3 1.10 9.3 10.06 137.0 6.83 116 48.8 49.2 7.6 13.2 5.1 2.1 7.6 8.0 <2 0.01 0.68 0.103 0.062 0.0020 0.0016' 0.0002 <0.00008 0.0114 0.0152 4.6 109 31 8.56 1.27 1.30 HISTORICAL(FY1213 TO FY1617) MAXIMUM ND ND 15.9 12.40 191.6 8.65 2076 87.5 86.0 5.9 18.0 8.9 2.8 9.0 11.0 5.4 0.12 1.70 1.850 2.500 0.0115 0.0044 0.0085 0.00057 0.1100 0.0600 253.8 165 120 185.00 3.20 2.97 GEOMEAN ND ND 11.3 8.06 132.5 7.12 80 51.5 55.1 4.8 13.3 5.2 2.2 6.4 6.4 <2 0.02 0.77 0.119 0.089 0.0013'0.0011' 0.0003 0.00016 0.0073 0.0061 3.1 109 32 4.64 2.09 2.16 MINIMUM ND ND 5.4 5.02 12.1 6.41 8 8.2 22.4 2.2 6.0 1.8 1.3 2.3 2.6 <2 <0.0012 0.31 0.042 0.025 0.0003'0.0005' 0.0000 <0.000022 0.0019' 0.0013' <2 13 <10 1.32 1.20 1.65 SUMMER ND ND 14.2 7.08 140.8 6.88 115 58.4 57.0 5.9 13.7 5.8 2.3 7.5 7.5 <2 0.02 0.77 0.117 0.101 0.0011'0.0010' 0.0001 0.00009' 0.0057 0.0056 2.9 114 30 3.48 1.68 1.86 WINTER ND ND 9.5 9.31 126.9 7.14 97 46.7 51.5 5.4 11.6 4.1 2.0 6.1 7.0 <2 0.02 0.75 0.118 0.075 0.0016'0.0013' 0.0003 0.00012 0.0097 0.0081 3.6 108 34 6.61 1.97 1.95 Notes: J-Estimated result(between the method reporting limit and method detection limit); H1-Hold time exceeded; NN-Parameter not accredited under NELAP for the analytical method used; ND-No Data; NA-Not Applicable;NS-Not Sampled;<,> -Result at method reporting limit shown City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 23 Table A.4 Boones Ferry Creek at Bryant Rd,Instream Monitoring Results,FY1819 Staff Water Specific E.coli Alkalinity Hardness, NH3, NO3, PO4, Q Gauge, Temp DO Conduct (MPN/ as CaCO3 as CaCO3 CL2 Ca Mg K Na SO4 BODS as N as N Total P as P Total Cu Diss Cu Total Pb Diss Pb Total Zn Diss Zn TSS" TDS TVS Turbidity TOC DOC Date (cfs) ft (°C) (mg/L) (µS/cm) pH 100mL) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (NTU) (mg/L) (mg/L) 07/11/18 12:30 0.0 NA 14.1 8.49 202.2 6.89 2 54 68.4 8.8 16.7 6.48 3.94 8.9 16.9 <2 0.08 3.37 0.163 0.08 0.0012' 0.0007' 0.0003' <0.00008 0.011 0.007 47.5 172 72 2.62 0.64 1.00 08/15/18 11:55 0.1 NA 15.3 7.81 201.8 6.76 461 NS 67.5 NS NS NS NS NS NS <2 0.02 2.98 0.095 0.10 0.0007' 0.0007' 0.00008' <0.00008 0.008 0.017 2.5 178 43 3.11 NS NS 09/13/18 13:30 0.1 NA 16.1 NS 249.1 6.81H1 1120 NS 87.1 NS NS NS NS NS NS <2 0.04 3.24 0.121 0.11 0.0050 0.0050 0.00010' 0.00005' 0.031 0.038 <2 209 54 9.54 NS NS 10/16/18 13:15 0.0 NA 14.5 7.56 190.2 6.82 13 56 64.5 8.6 15.8 6.08 4.19 9.6 14.2 <2 0.01 2.60 0.100 0.10 0.0010J 0.0007 0.00003' <0.00008 0.008 0.010 2.5 165 18 4.78 0.75 0.77 11/13/18 11:50 0.1 NA 12.0 8.16 195.2 7.01 6 NS 59.6 NS NS NS NS NS NS <2 <0.0012 3.64 0.089 0.08 0.0008J 0.0007' 0.00006' <0.000022 0.009 0.009 3.0 147 43 3.97 NS NS 12/20/18 12:50 2.1 NA 10.2 9.26 123.9 6.42 42 NS 43.9 NS NS NS NS NS NS <2 <0.0012 1.70 0.091 0.08 0.0026 0.0023 0.00013' <0.000091 0.021 0.035 <2 101 26 6.01 NS NS 01/15/19 13:00 0.6 NA 9.2 9.86 173.7 6.69 5 NS 56.5 NS NS NS NS NS NS <2 0.02 3.83 0.081 0.09 0.0015J 0.0014' 0.00014' <0.000091 0.018 0.028 <2 144 47 2.62 NS NS 02/14/19 11:55 4.8 NA 6.9 11.17 85.2 6.95 816 NS 30.0 NS NS NS NS NS NS <2 0.03 1.19 0.131 0.07 0.0027 0.0024 0.00090 <0.000091 0.029 0.027 18.0 76 29 33.90 NS NS 03/14/19 14:15 1.2 NA 8.9 11.02 189.8 6.88 15 42 62.7 10.0 15.4 5.89 3.86 10.0 12.0 <2 0.02 3.78 0.085 0.09 0.0013 J 0.0013 J 0.00006' <0.000091 0.018 0.024 <2 152 38 1.93 1.17 1.22 04/18/19 12:00 0.6 NA 11.5 9.41 189.4 6.76 16 NS 61.0 NS NS NS NS NS NS <2 0.01 4.08 0.096 0.09 0.0014' 0.0013 J<0.0000666<0.000091 0.018 0.016 <2 156 38 1.90 NS NS 05/15/19 11:45 0.2 NA 12.9 8.39 195.2 6.75 579 53 56.3 8.7 14.0 5.18 3.63 9.1 13.0 <2 0.02 2.90 0.105 0.10 0.0016 J 0.0016 J<0.0000553<0.000022 0.168 0.153 <2 164 48 4.26 1.75 1.76 06/20/19 10:54 0.1 NA 13.1 7.50 204.5 6.87 11 NS 68.5 NS NS NS NS NS NS <2 0.01 3.31 0.087 0.08 0.0014' 0.0010J<0.0000553<0.000022 0.025 0.022 <2 168 36 2.85 NS NS FY1819 MAXIMUM 4.8 NA 16.1 11.17 249.1 7.01 1120 56.1 87.1 10.0 16.7 6.48 4.19 10.0 16.9 <2 0.08 4.08 0.163 0.11 0.0050 0.0050 0.00090 <0.000091 0.168 0.153 47.5 209 72 33.90 1.75 1.76 GEOMEAN 0.2 NA 11.7 8.88 177.7 6.80 41 50.7 58.8 9.0 15.4 5.89 3.90 9.4 13.9 <2 0.01 2.90 0.102 0.09 0.0015J 0.0013J 0.00007 0.00003 0.019 0.022 2.2 148 39 4.25 1.00 1.13 MINIMUM 0.0 NA 6.9 7.50 85.2 6.42 2 41.5 30.0 8.6 14.0 5.18 3.63 8.9 12.0 <2 <0.0012 1.19 0.081 0.07 0.0007J 0.0007' <0.0000666<0.000022 0.008 0.007 <2 76 18 1.90 0.64 0.77 SUMMER 0.1 NA 14.2 8.04 209.7 6.82 92 53.2 68.9 8.7 15.3 5.79 3.78 9.0 14.8 <2 0.03 3.15 0.111 0.09 0.0016' 0.0013' 0.00007 <0.000022 0.026 0.027 2.6 178 49 3.94 1.06 1.33 WINTER 0.5 NA 10.2 9.41 157.9 6.79 23 48.3 52.5 9.3 15.6 5.98 4.02 9.8 13.1 <2 0.01 2.73 0.095 0.09 0.0015' 0.0013' 0.00007 <0.00008 0.016 0.019 2.0 130 33 4.50 0.94 0.97 Historical (FY1213 to FY1617) MAXIMUM NA 16.1 12.15 219.5 8.61 1046 87.0 96.0 39.0 25.0 7.40 5.10 14.0 17.0 51.0 0.10 6.20 1.000 0.25 0.0130 0.0041 0.00660 0.00050 0.120 0.042 100.0 290 160 38.70 3.20 8.60 GEOMEAN NA 12.0 8.12 168.0 7.13 20 47.0 61.0 8.3 14.8 5.24 3.83 8.6 10.6 <2 0.02 3.01 0.135 0.09 0.0017J 0.0012' 0.00030 0.00015 0.015 0.013 4.8 146 44 2.83 1.95 2.42 MINIMUM NA 3.3 2.56 69.8 6.49 <1 2.5 23.3 2.5 5.9 2.10 1.96 3.4 4.4 <2 <0.0012 0.05 0.050 0.03 0.0009J 0.0006J <0.0000666<0.000022 0.005 0.005 <2 10 17 0.84 1.60 1.50 SUMMER NA 14.6 7.95 179.2 7.04 22 59.7 69.3 10.5 17.3 6.24 4.25 10.1 13.2 <2 0.01 2.62 0.130 0.10 0.0014' 0.0011J 0.00019 <0.00008 0.014 0.012 4.6 170 47 3.21 1.54 2.01 WINTER NA 10.4 8.66 156.9 7.06 25 40.1 54.3 6.8 12.6 4.92 2.97 7.6 10.8 <2 0.01 3.13 0.123 0.09 0.0019J 0.0012' 0.00023 0.00010 0.018 0.016 3.5 131 40 3.04 1.40 1.39 Notes: J-Estimated result(between the method reporting limit and method detection limit);H1-Hold time exceeded; NN-Parameter not accredited under NELAP for the analytical method used; ND-No Data; NA-Not Applicable;NS-Not Sampled;<,> -Result at method reporting limit shown City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 24 Table A.5 Ball Creek bel Kruse Way,Instream Monitoring Results,FY1819 Alkalinit Hardness Staff Water Specific E.coli y as ,as NH3, NO3, PO4, Q Gauge, Temp DO Conduct (MPN/ CaCO3 CaCO3 CL2 Ca Mg K Na 504 BOD5 as N as N Total P as P Total Cu Diss Cu Total Pb Diss Pb Total Zn Diss Zn TSS" TDS TVS Turbidity TOC DOC Date (cfs) ft (°C) (mg/L) (lAS/cm) pH* 100mL) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (NTU) (mg/L) (mg/L) 07/11/18 13:10 0.5 NA 15.7 9.43 196.6 7.66 155 78.2 78.3 6.0 16.2 9.19 1.26 7.9 6.2 <2 0.01 0.63 0.115 0.08 0.0032 0.0011J 0.0007 <0.00008 0.036 0.008 3.0 146 31 5.24 1.40 1.78 08/15/18 12:55 0.3 NA 16.9 8.66 203.7 7.61 326 NS 83.3 NS NS NS NS NS NS <2 <0.0012 0.86 0.102 0.10 0.0030 0.0030 0.0002i <0.00008 0.021 0.028 4.0 159 38 5.17 NS NS 09/13/18 14:20 0.3 NA 14.4 NS 194.9 7.22H1 866 NS 78.2 NS NS NS NS NS NS <2 0.01 0.80 0.097 0.09 0.0060 0.0050 0.0001 0.00004' 0.036 0.038 2.5 164 35 9.54 NS NS 10/16/18 14:10 0.4 NA 12.7 8.87 189.1 7.75 59 81.5 75.9 5.5 15.1 9.27 1.47 8.0 5.8 <2 <0.0012 0.45 0.101 0.10 0.00015' 0.0011J 0.0001' <0.00008 0.012 0.015 2.5 146 <10 5.19 1.15 1.02 11/13/18 12:35 0.4 NA 8.0 11.07 189.3 7.69 261 NS 73.6 NS NS NS NS NS NS <2 <0.0012 0.42 0.074 0.07 0.0010J 0.0009' <0.0000666<0.000022 0.010 0.003 <2 131 25 3.05 NS NS 12/21/18 10:15 0.7 NA 8.4 11.92 160.4 7.40 387 NS 59.6 NS NS NS NS NS NS <2 <0.0012 1.03 0.050 0.05 0.0016J 0.0016J <0.0000553<0.000091 0.020 0.030 <2 112 34 5.14 NS NS 01/15/19 13:35 0.9 NA 6.3 11.39 170.5 7.40 17 NS 64.7 NS NS NS NS NS NS <2 0.01 0.73 0.048 0.05 0.0011J 0.0009' 0.00002' <0.000091 0.019 0.033 <2 125 21 7.00 NS NS 02/14/19 12:40 6.8 NA 5.2 12.24 54.1 7.44 980 NS 23.2 NS NS NS NS NS NS <2 0.01 0.34 0.138 0.07 0.0036 0.0029 0.0011 0.00017J 0.042 0.035 28.0 57 32 7.44 NS NS 03/14/19 14:50 1.8 NA 9.5 11.74 166.1 7.95 26 55.0 63.7 10.0 14.9 6.44 1.22 8.7 9.0 <2 0.01 0.75 0.044 0.04 0.0013J 0.0010J 0.00009J <0.000091 0.013 0.016 2.0 119 25 3.66 1.17 1.18 04/18/19 13:20 1.4 NA 12.9 10.53 167.8 7.95 28 NS 61.7 NS NS NS NS NS NS <2 0.01 0.64 0.047 0.04 0.0015J 0.0011J 0.00005' <0.000091 0.014 0.009 <2 114 16 5.68 NS NS 05/15/19 12:40 0.6 NA 12.9 9.78 186.6 7.80 118 69.0 66.0 7.4 14.5 7.23 1.25 7.6 7.0 <2 0.03 0.63 0.080 0.07 0.0043 0.0032 0.00022i 0.00003' 0.035 0.023 4.5 143 39 4.53 2.09 2.06 06/20/19 11:40 0.6 NA 13.0 10.03 195.5 7.96 2420 NS 77.4 NS NS NS NS NS NS <2 0.01 0.56 0.105 0.09 0.0051 0.0037 0.0004' 0.00006' 0.026 0.017 3.0 138 29 7.04 NS NS FY1819 MAXIMUM 6.8 NA 16.9 12.24 203.7 7.96 2420 81.5 83.3 10.0 16.2 9.27 1.47 8.7 9.0 <2 0.03 1.03 0.138 0.10 0.0060 0.0050 0.0011 0.00017 0.042 0.038 28.0 164 39 9.54 2.09 2.06 GEOMEAN 0.7 NA 10.7 10.45 165.4 7.65 176 70.1 64.4 7.0 15.2 7.94 1.30 8.0 6.9 <2 <0.0012 0.62 0.078 0.07 0.0019' 0.0018' 0.0001 0.00004 0.021 0.017 2.5 126 25 5.48 1.41 1.45 MINIMUM 0.3 NA 5.2 8.66 54.1 7.22 17 55.0 23.2 5.5 , 14.5 6.44 1.22 7.6 5.8 <2 <0.0012 0.34 0.044 0.04 0.0002' 0.0009' <0.0000553<0.000022 0.010 0.003 <2 57 <10 3.05 1.15 1.02 SUMMER 0.4 NA 14.5 9.46 195.4 7.65 416 73.5 76.4 6.7 15.3 8.15 1.25 7.7 6.6 <2 0.01 0.69 0.099 0.09 0.0042 0.0029 0.0003 <0.00008 0.030 0.020 3.3 150 34 6.07 1.71 1.91 WINTER 1.1 NA 8.6 11.05 146.9 7.65 95 67.0 57.0 7.4 15.0 7.73 1.34 8.3 7.2 <2 <0.0012 0.58 0.065 0.06 0.0011' 0.0012' <0.0000553<0.00008 0.017 0.015 2.0 111 20 5.09 1.16 1.10 Historical (FY1213 to FY1617) MAXIMUM ND NA 17.7 14.72 222.6 8.53 2419 110.0 94.0 7.1 18.0 11.00 1.80 9.3 9.4 3.00 0.10 3.00 0.930 0.21 0.0140 0.0130 0.00250 0.01700 0.057 0.044 72.5 190 69 91.00 4.22 4.60 GEOMEAN ND NA 11.8 9.65 157.4 7.77 135 62.6 65.0 5.9 14.9 7.03 1.58 7.5 6.9 <2 0.02 0.73 0.101 0.07 0.0021 0.0016J 0.00040 0.00035 0.014 0.010 4.4 126 34 4.53 2.45 2.35 MINIMUM ND NA 5.3 4.58 45.6 6.04 4 14.0 20.0 3.6 8.0 2.50 1.40 3.8 4.9 <2 <0.0012 0.16 <0.01 0.03 0.0003i 0.0008i <0.0000553<0.000022 0.005 0.002' <2 49 <10 1.03 1.80 1.60 SUMMER ND NA 15.0 9.06 182.4 7.77 234 73.6 75.5 6.6 16.7 8.80 1.51 8.5 6.9 <2 0.01 0.71 0.107 0.09 0.0022 0.0015' 0.00027 0.00016 0.014 0.009 3.8 141 36 4.22 2.06 2.06 WINTER ND NA 9.7 10.53 145.0 7.75 105 56.7 58.4 6.2 14.0 5.98 1.41 7.2 7.5 <2 0.01 0.73 0.085 0.05 0.0019' 0.0016' 0.00027 0.00020 0.018 0.014 3.7 116 29 4.97 1.83 1.83 Notes:J-Estimated result(between the method reporting limit&method detection limit); H1-Hold time exceeded; NN-Parameter not accredited under NELAP for the analytical method used; ND-No Data; NA-Not Applicable; <,> -Result at method reporting limit shown City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 25 Table A.6 Carter Creek abv Bangy Rd,Instream Monitoring Results, FY1819 Staff Water Specific E.coli Alkalinity Hardness, NH3, NO3, PO4, Total Q Gauge, Temp DO Conduct (MPN/ as CaCO3 as CaCO3 CL2 Ca Mg K Na 504 BODS as N as N Total P as P Total Cu Diss Cu Total Pb Diss Pb Zn Diss Zn TSS" TDS TVS Turbidity TOC DOC Date/Time (cfs) ft (°C) (mg/L) (µS/cm) pH 100mL) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L)I(mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (NTU) (mg/L)I(mg/L) 07/11/18 13:30 0.5 NA 19.1 5.12 275.4 7.21 129 109.3 109.7 11.7 25.8 11.0 1.9 10.1 6.8 3.0 0.06 0.16 0.161 0.04 0.0010 J 0.0008 J 0.0001 J <0.00008 0.007 0.004 8.5 187 34 5.24 3.96 4.15 08/15/18 13:35 0.3 NA NS NS NS 6.41 93 NS 113.5 NS NS NS NS NS NS <2 0.06 0.08 0.173 0.06 0.0020 0.0020 0.00012' <0.00008 0.005 0.011 2.5 197 46 9.01 NS NS 09/13/18 15:00 0.3 NA 16.1 NS 214.8 7.18H1 236 NS 88.4 NS NS NS NS NS NS <2 0.05 0.12 0.141 0.05 0.0060 0.0110 0.0001 J 0.00006' 0.008 0.021 5.5 158 38 8.73 NS NS 10/16/18 14:50 0.2 NA 12.2 5.01 258.3 7.30 47 113.8 110.3 9.9 26.2 10.9 2.5 9.6 8.9 <2 0.04 0.14 0.097 0.04 0.0013' 0.0015 J <0.0000067 <0.00008 0.005 0.008 2.5 178 11 12.50 3.56 3.44 11/13/18 13:15 0.2 NA 7.4 7.60 261.5 7.11 37 NS 107.5 NS NS NS NS NS NS <2 0.07 0.15 0.095 0.02 0.0039 0.0009 0.00045' <0.000022 0.024 0.012 2.5 170 30 8.37 NS NS 12/21/18 10:50 1.7 NA 7.9 9.69 204.0 7.14 43 NS 77.3 NS NS NS NS NS NS <2 0.04 0.83 0.067 0.03 0.0024 0.0021 0.00013' <0.000091 0.025 0.027 4.5 140 19 8.79 NS NS 01/15/19 14:10 2.9 NA 4.8 10.92 244.4 7.09 27 NS 99.3 NS NS NS NS NS NS <2 0.04 0.59 0.060 0.03 0.0012 J 0.0008 J 0.00002' <0.000091 0.017 0.015 2.5 165 41 7.22 NS NS 02/14/19 13:35 7.0 NA 5.7 11.52 97.3 7.33 980 NS 39.1 NS NS NS NS NS NS <2 0.04 0.39 0.104 0.04 0.0034 0.0032 0.0006 <0.000091 0.026 0.024 14.0 77 32 26.90 NS NS 03/14/19 15:45 1.8 NA 8.7 11.37 247.5 7.52 3 80.8 96.4 16 24.1 10.0 2.5 9.6 12 <2 0.04 0.59 0.051 0.02 0.0017 J 0.0014 J 0.00006' <0.000091 0.011 0.018 3.0 163 38 9.87 2.14 2.10 04/18/19 13:50 2.0 NA 13.6 9.69 251.4 7.46 84 NS 100.7 NS NS NS NS NS NS <2 0.05 0.52 0.079 0.02 0.0018J 0.0012J 0.00005' <0.000091 0.009 0.005 3.5 164 35 6.89 NS NS 05/15/19 13:30 1.0 NA 14.3 7.09 275.2 7.36 1203 104.0 96.9 12 22.8 9.7 2.0 9.9 10 <2 0.08 0.28 0.132 0.04 0.0046 0.0031 0.00018' 0.00004' 0.011 0.005 7.0 194 41 ND 4.95 4.85 06/20/19 12:15 0.4 NA 15.5 5.95 262.6 7.32 249 NS 105.0 NS NS NS NS NS NS <2 0.06 0.16 0.135 0.04 0.0016 J 0.0010 J 0.0003 J 0.00004 J 0.008 0.007 9.0 178 28 20.00 NS NS FY1819 MAXIMUM 7.0 NA 19.1 11.52 275.4 7.52 1203 113.8 113.5 16.0 26.2 11.0 2.5 10.1 12.0 3.0 0.08 0.83 0.173 0.06 0.0060 0.0110 0.0006 0.00006' 0.026 0.027 14.0 197 46 26.90 4.95 4.85 GEOMEAN 0.9 NA 10.4 8.02 228.1 7.20 93 101.1 92.4 12.2 24.7 10.4 2.2 9.8 9.2 <2 0.05 0.26 0.101 0.03 0.0022 0.0017' 0.0001' 0.00004' 0.011 0.011 4.5 160 31 10.00 3.50 3.47 MINIMUM 0.2 NA 4.8 5.01 97.3 6.41 3 80.8 39.1 9.9 22.8 9.7 1.9 9.6 6.8 <2 0.04 0.08 0.051 0.02 0.0010' 0.0008' <0.0000067<0.000022 0.005 0.004 2.5 77 11 5.24 2.14 2.10 SUMMER 0.5 NA 16.2 6.00 255.7 7.09 243 106.6 102.3 11.8 24.3 10.3 2.0 10.0 8.2 <2 0.06 0.15 0.148 0.05 0.0025 0.0022 0.0001J 0.00004' 0.008 0.008 5.9 182 37 9.53 4.43 4.49 WINTER 1.3 NA 8.1 9.09 213.8 7.28 47 95.9 85.9 12.6 25.1 10.4 2.5 9.6 10.3 <2 0.04 0.38 0.077 0.03 0.0020 0.0014' 0.0001J <0.00008 0.014 0.014 3.7 146 27 10.28 2.76 2.69 Historical (FY1213 to FY1617) MAXIMUM ND NA 21.0 12.95 314.8 12.20 >2420 130.0 150.0 8.9 27.0 12.0 2.7 11.0 19.0 3.1 0.54 2.00 0.650 0.25 0.0071 0.0056 0.0020 0.00050 0.049 0.030 37.5 210 140 68.30 5.60 5.10 GEOMEAN ND NA 12.2 7.14 207.6 7.54 120 79.6 89.9 6.6 19.9 7.9 2.1 8.0 8.6 <2 0.04 0.40 0.102 0.06 0.0018' 0.0014' 0.0003' 0.00013' 0.011 0.007 3.7 153 39 6.60 4.06 3.73 MINIMUM ND NA 4.4 2.79 75.1 6.94 10 2.5 29.3 3.1 7.6 2.5 1.6 3.0 4.3 <2 <0.0012 0.06 0.025 0.03 0.0009' 0.0006 <0.0000067<0.000022 0.004 0.002' <2 73 13 1.13 3.00 2.70 SUMMER ND NA 17.2 5.64 238.3 7.42 201 98.0 103.6 9.1 24.6 10.3 2.1 10.0 8.9 <2 0.04 0.22 0.145 0.08 0.0020 0.0014' 0.0002' 0.00006i 0.009 0.006 4.6 171 40 7.56 4.60 4.43 WINTER ND NA 9.3 8.91 193.6 7.52 85 71.0 81.5 7.4 18.6 7.3 2.0 7.4 9.5 <2 0.04 0.52 0.082 0.04 0.0019' 0.0014' 0.0002' 0.00011' 0.014 0.009 3.6 142 35 7.03 3.01 2.96 Notes: J-Estimated result(between the method reporting limit and method detection limit); H1-Hold time exceeded; NN-Parameter not accredited under NELAP for the analytical method used; ND-No Data; NA-Not Applicable;NS-Not Sampled;<,> -Result at method reporting limit shown City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 26 Table A.7 Wet Weather Results at Reese Rd and at South Shore Blvd,December 20,2018 Storm Event Precipitation=0.1 inches; Prey 24-hr Precipitation=0 inches Specific E.coli Alkalinity Hardness NH3,as NO3,as PO4, Flow Water Conduct DO (MPN/ (as CaCO3) (as CaCO3) BOD5 N N Total P as P Total Cu Diss Cu Total Pb Diss Pb Total Zn Diss Zn TSSNN TDS TVS Turbidity Sample ID Time (cfs) Temp(°C) (µS/cm) pH (mg/L) 100mL)I (mg/L) (mg/L) (mg/L) (mg/L) I (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) I (mg/L) (mg/L) (mg/L) (mg/L) (NTU) South Shore Grab Sample 1 9:20 1.05 10.9 122.4 6.72 10.69 1986 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 21.1 South Shore Grab Sample Dup 1 9:21 NR NR NR NR NR >2420 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NR South Shore Grab Sample 2 11:05 3.11 10.8 72.6 6.69 10.95 1414 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 20.1 South Shore Grab Sample Dup 2 11:06 NR NR NR NR NR 1414 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NR South Shore Composite Sample 11:40 NA NA NA NA NA NA 22.0 35.3 <2 0.01 1.52 0.053 0.04 0.0053 0.0029 0.00062 <0.000091 0.029 0.029 9.0 77 30 NA South Shore Composite Sample Dup 11:41 NA NA NA NA NA NA 23 34.6 <2 0.01 1.53 0.057 0.04 0.0051 0.0030 0.00057 <0.000091 0.029 0.032 11.5 79 25 NA Reese Rd Grab Sample 1 8:50 0.002 9.8 57.8 7.0 10.16 >2420 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 546.0 Reese Rd Grab Sample 2 10:35 0.018 11.7 53.8 6.9 8.95 >2420 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 135.0 Reese Rd Composite Sample 10:40 NA NA NA NA NA NA 16.0 24.7 12 0.26 0.34 0.467 0.21 0.0260 0.0068 0.0070 0.00044' 0.161 0.059 114 66 75 NA Reese Rd Blank 8:51 NA NA NA NA NA <1 <1 <0.01 <2 0.02 <0.005 <0.0026 <0.01 0.0005J 0.0003J <0.0000067<0.000091 0.0007J 0.004 <2 <10 <10 NA Votes: J-Estimated result(between the method reporting limit and method detection limit); NN-Parameter not accredited under NELAP for the analytical method used; NA-Not Applicable;NR-Not Recorded;<,> -Result at method reporting limit shown City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 27 Table A.8 Wet Weather Results at Reese Rd and at South Shore Blvd,February 1,2019 Storm Event Precipitation=0.18 Inches; Prey 24-hr Precipitation=0 Water Specific E.coli Alkalinity Hardness NH3, NO3,ad Flow Temp Conduct DO (MPN/ as CaCO3 (as CaCO3) BOD5 as N N Total P PO4,as Total Cu Diss Cu Total Pb Diss Pb Total Zn Diss Zn TSSNN TDS TVS Turbidity Sample ID Time (cfs) (°C) (µS/cm) pH (mg/L) 100mL) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) 1 (mg/L) P(mg/L) (mg/L) (mg/L) 1 (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (NTU) South Shore Grab Sample 1 11:35 0.67 8.3 103.8 6.73 11.53 219 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NR South Shore Grab Sample Dup 1 11:36 NR NR NR NR NR 228 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NR South Shore Grab Sample 2 15:30 1.34 9.1 80.8 6.67 11.29 28 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 205.0 South Shore Grab Sample Dup 2 15:31 NR NR NR NR NR 33 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NR South Shore Composite Sample 15:30 NA 9.2 94.2 6.85 9.2 NA 22.3 28.9 2 0.02 1.37 0.049 0.01 0.0060 0.0054 0.00042' <0.000091 0.024 0.028 6.5 73 17 13.0 South Shore Composite Sample Dup 15:31 NA NR NR NR NR NA 15.4 29.8 <2 0.02 1.36 0.050 0.01 0.0062 0.0055 0.00041' <0.000091 0.025 0.026 7.0 74 16 NR Reese Rd Grab Sample 1 10:50 0.002 9.0 86.5 6.5 9.45 120 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 125.0 Reese Rd Grab Sample 2 14:30 0.002 11.3 74.6 6.4 10.15 28 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 135.0 Reese Rd Composite Sample 14:50 NA 9.9 76.5 6.7 9.96 NA <5 23.9 16 1.02 0.63 0.273 0.04H1 0.0250 0.0120 0.0037 0.00055 0.232 0.149 52 73 59 174.0 Reese Rd Blank 14:40 NA NA NA NA NA <1 8.7 <0.01 <2 0.01 <0.005 <0.0026 <0.01 ND 0.0012' <0.0000067 <0.000091 <0.00055 0.003 <2 <10 <10 NA Notes: J-Estimated result(between the method reporting limit and method detection limit); NN-Parameter not accredited under NELAP for the analytical method used; NA-Not Applicable;NR-Not Recorded;<,> -Result at method reporting limit shown City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 28 Table A.9 Wet Weather Results at Reese Rd and at South Shore Blvd,March 27,2019 Storm Event Precipitation=0.33 Inches; Prey 24-hr Precipitation=0 Water Specific I E.coli Alkalinity Hardness NH3, 'NO3,asl Flow Temp Conduct DO (MPN/ as CaCO3 (as CaCO3) BODs as N N Total P PO4,as Total Cu Diss Cu Total Pb Diss Pb Total Zn Diss Zn TSSNN TDS TVS Turbidity Sample ID Time (cfs) (°C) (µS/cm) pH (mg/L) 100mL) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) 1 (mg/L) P(mg/L) (mg/L) (mg/L) 1 (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (NTU) South Shore Grab Sample 1 13:00 1.52 9.7 69.2 7.39 11.35 548 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 46.2 South Shore Grab Sample Dup 1 13:01 NR NR NR NR NR 770 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NR South Shore Grab Sample 2 14:15 1.47 10.0 49.4 7.29 11.19 >2420 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 23.6 South Shore Grab Sample Dup 2 14:16 NR NR NR NR NR >2420 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NR South Shore Composite Sample 14:30 NA 10.1 57.6 7.44 8.86 NA 16.6 21.8 3 0.05 0.53 0.112 0.03 0.0120 0.0074 0.00088 <0.000091 0.026 0.013 30.5 50 16 34.2 South Shore Composite Sample Dup 14:31 NR NR NR NR NR NA 16.2 21.5 3 0.07 0.53 0.110 0.05 0.0120 0.0075 0.00089 0.00076 0.025 0.013 28.0 41 15 NR Reese Rd Grab Sample 1 12:30 0.003 12.7 108.2 7.7 7.75 47 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 369.0 Reese Rd Grab Sample 2 13:30 0.012 11.5 412.4 7.1 7.61 102 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 188.0 Reese Rd Composite Sample 13:45 NA 11.6 306.8 7.2 7.32 NA 16.2 38.3 15 0.97 0.49 0.458 0.17 0.0340 0.0150 0.0076 0.00023' 0.227 0.121 150 204 97 261.0 Reese Rd Blank 13:15 NA NA NA NA NA <1 <5 <0.01 <2 0.03 0.02 <0.0026 0.01 0.0003i 0.00024' <0.0000067 <0.000091 <0.00055 0.0014i <2 <10 <10 NA Notes: J-Estimated result(between the method reporting limit and method detection limit); NN-Parameter not accredited under NELAP for the analytical method used; NA-Not Applicable;NR-Not Recorded;<,> -Result at method reporting limit shown City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 29 This page intentionally left blank City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 30 APPENDIX B 2012 SWMP IMPLEMENTATION STATUS City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 31 This page intentionally left blank City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 32 Table B.1. Stormwater Management Plan Metrics, FY1819 Progress Key to BMP Parameter Symbols: A full circle(•) indicates the BMP is expected to address the parameter.An empty circle(0) indicates the BMP may be expected to address the parameter. A blank cell indicates that the effect of the BMP is uncategorized. Does the BMP Address: Best Management Hg or Reporting Measurable Goals Tracking Measures Bacteria P Tracking Measure Status,Permit Year 2018-2019 Practice or Activity SVS Department (2012 SWMP) (2012 SWMP) 1)Conduct dry weather field screening at 100%of 1)Track the number and percent of priority 1)All priority outfalls were inspected in FY1718. priority outfalls within the City annually. Based on outfalls inspected annually. 2) No followup investigations were required. BMP ILL1 Implement results of annual inspections and any citizen the Illicit Discharge 0 0 0 Engineering reports,conduct follow-up investigations and take 2) Describe results of all follow up Elimination Program enforcement actions. investigations conducted. Additional Commitment: Develop an IDDE Enforcement Response Plan by November 1,2012. Public Works 1) Respond to all spills reported to the CityusingIndicate the number of spills reported 1)and 2) Lake OswegoDepartment responded to 158 incidents of which 32 involved spills. LO Fire Dept p p p 1) p p Fire p p general procedures outlined under BMP ILL2. annually. Of those,only 1 entered the stormwater system. Spills were primarily cleaned up using granular 2)Track the number of spills responded to by absorbent. Engineering responded to nine incidents involving an illicit discharge with the majority the City. of them involving sediment discharging to a catchbasin. 3)The Lake Oswego Fire Department responded to 158 incidents, primarily auto accidents,of 3) Describe activities conducted as a result of which 32 involved spills. Spills were primarily cleaned up with granular absorbent. Other City BMP ILL2-Implement each spill the Spill Response 0 0 0 staff responded to nine incidents involving an illicit discharge(see Table 8)with six receiving a Program citation. The majority of the incidents involved sediment or concrete washwater discharging to a catchbasin. Other activities: The program includes a spill response plan, spill and citizen complaint response, outfall monitoring, wastewater conversions from septic systems, and notifying DEQ of businesses in the city limits which may require an industrial stormwater permit (1200-Z). In FY1819,the City updated its Spill Response Plan with a requirement for annual training along with a map and list of its underground injection control facilities(UICs). Public Works 1) Ensure all identified cross connections are 1) Indicate the number of cross connections 1) No wastewater to stormwater cross-connections were discovered in FY1819. BMP ILL3-Control abated upon discovery. discovered and abated annually. Infiltration and Cross • 0 0 Connections to the Stormwater System Engineering 1)The City sent six notification letters,with DEQ's 1200-Z program manager cc'ed,to businesses 1) Annually review and update the list of industrial 1)Track the number of potential high dischargers and potential high pollutant source pollutant source facilities identified annually. within its jurisdiction that are potentially subject to a 1200-Z permit. The businesses included BMP IND1 Screen facilities to the City's MS4 system. metal fabrication (SIC 34), boat repair(SIC 3732),and marina (SIC 4493)services. Each business Existing and New 0 0 0 2)Track the number of industrial facilities was required to provide a copy of DEQ's decision regarding the permit to the City. Industrial Facilities 2) Notify the industrial facility and DEQ when requiring permits identified annually. facilities are identified that are subject to an 2)One business,a marina,was determined by DEQ to not require a 1200-Z permit. Another industrial stormwater permit. business(boat repair) provided a No Exposure Certification (NEC)to the DEQ. The other businesses have not provided information on DEQ's decision to the City. City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 33 Does the BMP Address: Best Management Hg or Reporting Measurable Goals Tracking Measures Practice or Activity Bacteria P SVS Department (2012 SWMP) (2012 SWMP) Tracking Measure Status,Permit Year 2018-2019 Engineering 1) Developa strategyfor highpollutant source 1)Track the number and results ofpotential 1)The strategyfor inspecting highpollutant-source facilities was completed in June 2014; usinga BMP IND2-Conduct g p g g p facility inspections and follow up by July 1, 2013. high pollutant source facility inspections. combination of business licenses,SIC codes, DEQ permit searches,and business types. Inspections of High Pollutant Source 0 0 0 2) Inspect the identified, potential high pollutant No inspections were performed during the reporting period. Facilities source facilities a minimum of once over the permit term. Engineering 1) Implement ESC program by issuing permits. 1) Record the number of City ESC permits 1)There were 175 erosion and sediment control (ESC) permits approved during FY1819. Most 2) Provide wet weather construction requirements issued annually. (148)were associated with a building permit; 28 were for capital improvement project, public BMP EC1-Implement with all City ESC permits. improvement projects, or flatwork not associated with a building permit. the Erosion and 2)The first requirement of the standard notes states that wet weather provisions must be in Sediment Control(ESC) • • 0 Additional Commitment: Document updates to the followed from October 1ST to May 315T. All permits are provided with the construction Manual and Municipal Clackamas County ESC Planning and Design Code Manual and the City's Design and Construction requirements for the wet weather period. Standards for Sanitary Sewer and Surface Water 3)There were no updates to the ESC Manual nor the Stormwater Management Manual. Management,as necessary. Engineering 1)Conduct an initial and final site inspection for all 1)Track the number of initial and final ESC 1) All initial inspections include conditions and all inspections include some type of corrections. construction sites requiring an ESC permit. inspections conducted Initial ESC inspections were completed at 117 and 191 final inspections. 2) Conduct at least one unscheduled inspection 2)Track the number of unscheduled 2)There were 131 intermediate ESC inspections. BMP EC2-Conduct ESC during active construction at all sites requiring a City inspections. ESCpermit, and conduct additional inspections for 3)There were 27 ESC inspections that required more than three inspections. Inspections and 0 • • p 3)Track the number of sites with more than 3 Enforcement problematic sites. 4) Eight citations were issued; one in the Tualatin River watershed for working without a permit inspections. 3) In conjunction with construction activities and seven for failure to install and/or maintain ESCs at projects scattered throughout the city requiring a City-issued ESC permit, implement an 4)Track the number of enforcement actions except in the Willamette River watershed. including written warnings. escalating enforcement matrix. City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 34 Does the BMP Address: Best Management Hg or Reporting Measurable Goals Tracking Measures Practice or Activity Bacteria P SVS Department (2012 SWMP) (2012 SWMP) Tracking Measure Status,Permit Year 2018-2019 Engineering 1) Provide educational materials two times per 1)Summarize the distribution and content of To leverage public education,outreach,and involvement efforts,the City is a member of the Public Works year related to impacts of fertilizers, herbicides, outreach material related to landscape Regional Coalition for Clean Rivers and Streams(Regional Coalition), Clean Rivers and Streams Public Affairs and pesticides on water quality and on the use of management on an annual basis. (state-wide), KOIN's Clean Water Partners,the Tualatin Basin Public Awareness Committee alternative,environmentally-friendly products. (TBPAC), and the Regional Water Providers Consortium (RWPC). The Regional Coalition, KOIN, 2) Provide educational materials related to 2)Summarize the distribution and content of and RWPC support media-based education while TBPAC focuses on hands-on outreach efforts. watershedprotection, proper disposal practices, outreach material related to proper disposal 1) Staffprovided or supported theprovision of the followingmaterials related to landscape p p p practices for oil, hazardous waste, paints, pp p and facilitation of public reporting of illicit management: discharges annually. etc.,on an annual basis. • Items available for pickup at City Hall consisting of: brochures on safe alternatives to 3)Conduct catchbasin marking during the permit 3)Track the number and percent of total landscape chemicals;a safe cleaning product shopping list pad;and spray bottles with recipes term. catchbasins marked annually. for insecticidal soap and garlic spray insect repellant. 4) Continue participation with the Regional 4) Report on the status of the public • The City continued residential composting program associated with yard waste pickup by Coalition of Clean Rivers and Streams. education effectiveness evaluation. Republic Services. 5) Coordinate with other local, Phase I permittees • HelloLO is mailed to all residents and businesses in the City's Urban Services Boundary(zip in the public education effectiveness evaluation. codes 97034 and 97035,along with selected residents of Portland zip code 97219)and is the 6) Additional Commitment: Document other primary written means of reaching city residents.Three times a year,the Water Conservation public education and outreach activities not BMP PE1-Provide Program has a dedicated insert.See Appendix C for details on the subjects and timing. specified as a measurable goal. • DuringFY1819,staff provided water conservation audits for 59 residential and 2 commercial Public Education and O O 0 Outreach Materials properties. During the audits, owners are educated about landscape management in regard to Regarding Stormwater proper storage, use, and keeping materials out of the street. • The City provided information on proper fertilizer application through its newsletter and social media. • Through the Regional Water Provider's Consortium,the City provides support for TV ads and Garden Time spots about proper landscape management. 2) As part of our regional partnership with KOIN-TV, there were Public Service Announcements (PSAs)for proper disposal of automotive fluids, proper leaf disposal and removal of leaves from catchbasin grates, proper fertilizer applications, proper disposal of RV waste, draining of hot tubs, and pressure washing. Approximately 40 PSAs were broadcast each month which reached an average of 780,000 people through the KOIN-TV website, Facebook page, and PSAs. 3) In FY1819, 222 markers were placed throughout the City. . 4)The Public Education Effectiveness Evaluation was submitted to DEQ on July 1, 2015. Other Activities: The City also provides$38,000 to the regional Backyard Habitat Certification program. BMP PE2—Provide Engineering 1) Continue to provide access to the Erosion 1) N/A 1)City staff provides one-on-one education at the initial inspection in response to questions by Erosion Education to 0 0 0 Prevention and Sediment Control Planning and contractors. Construction Site Design Manual to engineers,contractors,and Operators developers. City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 35 Does the BMP Address: Best Management Hg or Reporting Measurable Goals Tracking Measures Practice or Activity Bacteria P SVS Department (2012 SWMP) (2012 SWMP) Tracking Measure Status,Permit Year 2018-2019 Parks 1) During the permit term, require training and 1) Report on the number of staff attending 1)Seventeen staff or contractors were certified or re-certified for pesticide applications. certification in accordance with Oregon continuing education classes to maintain ODA Department of Agriculture regulations. Require applicator license. BMP PE3-Conduct Staff staff to maintain certification. Training for Pest 0 0 0 Management 2) In accordance with the update of the City's IPM Practices(see BMP PEST2),annually train staff on new maintenance activities,once revised IPM procedures have been adopted. BMP PE4-Conduct Staff Public Works 1) Provide spill response training to appropriate city 1) Track the number of employees receiving (1) Six staff were trained in spill response and 52 staff were provided with the 8-hr HAZWOPER Training in Spill 0 0 0 staff annually. spill training annually. training. Response Engineering 1)Conduct 2-4 meetings annually for employees 1)Track the number of employees attending 1) Eight staff attended a webinar on operations and maintenance requirements of vegetated associated with stormwater management within meetings regarding stormwater management stormwater facilities; 14 staff attended a webinar on pervious pavement design and the City. annually. maintenance; 1 person received a green infrastructure certification from Washington Stormwater 2)Coordinate annually with other Clackamas 2)Track the number of joint projects related Center;and 1 person re-certified as a CESC/ESC Inspector. Three city staff attended the County co-permittees regarding regional water to stormwater management in which the City Stormwater Summit in Eugene, Oregon. quality efforts. is currently involved. 2) No joint stormwater projects were undertaken by the City in FY1819. BMP PE5-Promote Staff Education and O O O 3)Throughout the permit term, participate,where Participation practicable, in conferences and training opportunities available through state and local agencies. 4)Additional Commitment: Continue to attend and participate in conferences, meetings,and seminars related to stormwater and surface water quality. Engineering 1)Continue to review all new development 1)Track the number of new development 1)The number of new development applications reviewed reflects parcels with complete building BMP DEV1— applications for compliance with existing standards applications reviewed for stormwater quality permit applications. Multiple applications can be associated with the same parcel, i.e. multiple • • • for water quality. compliance. structures such as a detached garage at the same address. Development Review There were 54 land-use applications reviewed for stormwater requirements. Engineering 1) During permit year 1, review current municipal (1) N/A code provisions for consistency with NPDES MS4 BMP DEV2-Review and permit language. Review the City's Surface Water Update the Municipal Technical Handbook and other local jurisdiction's Code and Development • • • stormwater design manuals and develop a manual Standards Related to consistent with NPDES MS4 permit language. Stormwater 3) Update the City's existing post-construction stormwater design standards and code language by November 1,2014. City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 36 Does the BMP Address: Best Management Hg or Reporting Measurable Goals Tracking Measures Practice or Activity Bacteria P SVS Department (2012 SWMP) (2012 SWMP) Tracking Measure Status,Permit Year 2018-2019 Public Works •Annually sweep all curbed arterial streets 1) List all curbed arterial streets and dates The sweeping dates are maintained in the City's asset management system which is available for BMP OM1—Street between 13 and 22 times. swept. review. Public Works reported that 1,228 cu yd of debris was collected and 4016 curb miles were O O • swept resulting in 0.31 cu yd of debris collected per curb mile. Sweeping •Annually sweep all curbed residential streets 2) List all curbed residential streets and dates between 2 and 6 times. swept. Public Works 1) Pick up all deicing materials as promptly as 1) Report the volume of leaves collected from 1) Public Works reported that 1,952 cu yds of leaves were collected during FY1819. weather and resources allow. city streets in the annual report. 2)The City provided information on proper leaf disposal through its social media posts and 2) Pick up all leaf debris from city streets a newsletters. In addition,two Neighborhood Associations took advantage of the City's offer to BMP 0M2—Deicing and 2) Provide the description of leaf collection Leaf Collection O O • minimum of once per season to prevent inlet information that is distributed to the public provide dropboxes for leaf collection. Through the City's regional partnership for PSAs with KOIN- clogging and localized flooding. TV,the public was educated on proper leaf disposal and the removal of leaves from catchbasins for leaf pick up and recycling. to prevent flooding. The 40 PSAs broadcast each month reached an average of 660,000 people 3) Promote yard waste collection services provided each month through the PSA broadcast,the KOIN-TV website,and Facebook. by City Waste Contractor once per year BMP 0M4-Reduce the Public Works 1) Inventory facilities subject to this permit 1)Track the status of inventorying and 1)The City has no formal strategy to minimize stormwater generated by City-owned buildings or Impact of Stormwater O O O requirement and implement and track strategies to implementing strategies at facilities subject properties other than to follow the requirements of the municipal code and the SWMM. Runoff from Municipal reduce the impact of stormwater runoff from these to this requirement. Facilities facilities by July 1,2013. Public Works 1) Inspect the public stormwater conveyance 1)Track the number and length of 1) Public Works reported that 2 stormwater inlets and 116 stormwater manholes were inspected system components(pipes,culverts,ditches, and conveyance system components inspected and cleaned. Stormline was also inspected-75 ft of stormline was replaced and 1,000 ft was BMP 0M5—Inspection inlets) during the permit term. annually. cleaned. No specific watersheds were targeted. and Maintenance of Public Conveyance • 0 • 2) Based on the results of inspections and citizen 2) Describe all maintenance activities 2) Public Works reported that 6,500 gallons of a magnesium chloride de-icer was used in FY1819. System Components complaints, maintain/ repair the conveyance potentially impacting water quality that are Staff maintain fire hydrants in the City Limits;the water is dechlorinated when they are flushed system components in need of service during the conducted annually. for maintenance of the hydrants and the lines. permit term. Public Works 1) Inspect all public sumped catchbasins. 1)Track the number and percent of 1)and 2) Public Works reported that 1,488 catchbasins were inspected and cleaned. BMP 0M6—Inspection catchbasins inspected annually. and Maintenance of Public Sumped • 0 • 2) Maintain a minimum of 90%of the city owned 2)Track the number and percent of Catchbasins sumped catchbasins annually, based on regular catchbasins maintained annually. maintenance schedules and results of inspections. Public Works • Develop a program to track and report on public 1)Track the status of the program to track 1) The City has historically inspected private stormwater facilities on a complaint-driven basis. In Engineering and private stormwater facility maintenance public and private stormwater facility FY1819,the City updated its policies and procedures to provide a uniform approach to the program. activities by July 1, 2013. operation and maintenance. The update is currently under internal review. • Inspect all public stormwater facilities. 2)Track the number and percent of public BMP 0M7—Tracking, • Conduct routine maintenance activities to ensure stormwater facilities inspected. 2)and 3) Staff maintained two bioswales in FY1819. Maintenance on the remaining facilities in Maintenance,and • • • functionality of public stormwater facilities. 3)Track the number of public stormwater FY1819 was not tracked by facility. Inspection of Stormwater Facilities • Maintain an inventory of private stormwater facilities maintained and provide a 4) No private water quality facilities were formally inspected in FY16-17. facilities. description of maintenance activities. •Annually inspect 10%of private water quality 4)Track the number and percent of private facilities for which an O&M agreement is on file stormwater facilities inspected. Document with the City. the date of inspection. City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 37 Does the BMP Address: Best Management Hg or Reporting Measurable Goals Tracking Measures Practice or Activity Bacteria P SVS Department (2012 SWMP) (2012 SWMP) Tracking Measure Status,Permit Year 2018-2019 Public Works 1)Continually ensure that 100%of pesticide 1) Following development of a process for 1)The primary pesticides used were glyphosate(herbicide)and propiconazole(fungicide). Parks applicators operating within the public right-of-way inventorying pesticides,annually report on are certified and licensed. the quantity of pesticides applied to City Brand Active Ingredients Gal Lbs 2) By November 1,2012, develop a process to property. 2,4-D(28.57%); Mecoprop-p acid (5.88%); Dicamba acid (1.71%); inventory pesticides applied to co-permittee 2)Annually report any efforts and Speedzone and Carfentrazone-ethyl (0.62%) 1.9 1.3 owned or operated property. Upon development alternatives to reduce the quantity of 2 [4,5 dihydro 4 methyl 4 (1 methylethyl) 5 oxo 1H imidazol 2 of theprocess,annuallyinventorypesticide use onpesticides used bythe Cityon CityImazapyr yl] 3 pyridinecarboxylic acid). 0.1 applicable property. Transline Clopyralid 0.7 Secure Fluazinam 0.5 Sureguard Flumioxazin 1.7 Cheetah Pro Glufosinate ammonium 0.3 BMP PEST1—Reduce Rodeo Glyphosate 70.4 Pollutants in Discharges MSM 60 DF Metsulfuron-methyl(60%) 2.9 associated with Turfcide Pentochloronitrobenzene 150.0 Pesticide, Herbicide, 0 • 0 Affirm Polyoxin D zinc salt 3.6 and Fertilizer Prophecy Propiconazole 200.0 Applications Instrata Propiconazole(4.7%)and fluidoxinol(1.2%) 5.0 LandmarkXP Sulfometuron methyl(50%)and Chlorsulfuron(25%) 0.7 5.9 SFM 75 Sulfometuron methyl 1.0 Garlon 3A Triclopyr 31.9 Snapshot Trifluralin 12.5 2-pyridine carboxylic acid, 4-amino-3,6-dichloro-2- Milestone pyridinecarboxylic acid 1.9 Total 113.3 378.9 2)Staff have increased the amount of mulching and manual removal done to maintain properties. They minimize the use of pre-emergence herbicides. BMP PEST2—Update Public Works 1)Continue to implement and by November 1, 1) N/A The City reviewed the March 6, 2013 Integrated Pest Management Practices guidance document. the City Integrated Pest 0 • 0 Parks 2014, update the City of Lake Oswego Integrated No changes were made during the reporting year. Management Plan Pest Management Plan as necessary City of Lake Oswego MS4 and TMDL Annual Report_FY1819 Page 38 APPENDIX C. TMDL IMPLEMENTATION PLAN, 2018-2019 ANNUAL REPORT City of Lake Oswego, Oregon TMDL IMPLEMENTATION PLAN ANNUAL REPORT COVERING JULY 1, 2018 TO JUNE 30, 2019 Prepared for the Oregon Department of Environmental Quality October 31, 2019 OREG} City of Lake Oswego_MS4 and TMDL Annual Report_FY1819 Page 39 This page intentionally left blank City of Lake Oswego_MS4 and TMDL Annual Report_FY1819 Page 40 C.1. Introduction The Clean Water Act (CWA) was enacted in 1972 to "restore and maintain the chemical, physical, and biological integrity of the Nation's waters". After point sources such as industrial areas and wastewater treatment plants were regulated,the USEPA found that the rivers and streams were still in need of water quality improvement. As a consequence, the Municipal Separate Storm Sewer System (MS4) permit system was implemented in 1990 to regulate stormwater discharges from municipalities, counties, and other entities that met the MS4 permit thresholds of either being in an urbanized area or having a minimum population of 10,000 plus a density of 1,000 people/square mile. After the MS4 permits were implemented, it was determined that certain watersheds needed a further reduction of pollutants. Under Section 303(d)of the CWA,entities that administer the CWA must identify watersheds that do not have sufficient water quality to meet their strictest beneficial use. In Oregon,the Department of Environmental Quality (DEQ) administers the CWA. DEQ determines the total maximum daily load (TMDL) that each watershed can carry for all analytes (chemicals) that are keeping the watershed from achieving its most beneficial use. Entities which have non-point source discharges, such as counties and cities, are designated as management agencies for these pollutants. The City of Lake Oswego (City) was determined to be a Designated Management Agency (DMA) for the following constituents (See Table C.1). Table C.1.TMDLs for which Lake Oswego is the DMA Time frame TMDL Water Body(by basin) ate Parameter • Springbrook Creek • Bacteria • Oswego Lake/Oswego Creek 2006 • Mercury • Tryon Creek • Temperature(target is effective shade) • Lower Willamette River • pH 1988 1988 • Chlorophyll a(target is phosphorus) to • Dissolved oxygen (target is total suspended solids(TSS)) 2014 . Tualatin River Updated 1988 parameters and added: 2001 • Temperature(target is effective shade) • Fanno Creek and its tributaries • Bacteria • Oswego Lake(for phosphorus only) Updated: • 2012 pH • Chlorophyll a(target is phosphorus) • DO(target pollutant is TSS) • Bacteria • Mercury 2014 2006 • Lower Willamette River • Temperature(target is effective shade) to 2019 • Tualatin River 20d2 • pH • Chlorophyll a(target is phosphorus) • DO(target is TSS) C.2. TMDL Implementation Plan Revisions The Willamette River and Tualatin River have Water Quality Management Plans (WQMPs) associated with their TMDLs. These WQMPs provide guidance for reducing the constituents that have TMDLs and they require a revision of the City's TMDL Implementation Plan ("Plan") every 5 years. City of Lake Oswego_MS4 and TMDL Annual Report_FY1819 Page 41 In FY1718,the City revised its Plan in response to DEQ's decision to align the Willamette River and Tualatin River WQMP timelines. The City submitted its revised Plan to DEQ on October 31, 2018 for their review. C.3 Development Impervious area within the City limits increased 7 acres in FY1819 to 2,286 acres(see Table C.2)with most of the annexations in either the west or east side of Lake Oswego as opposed to the central section (see Figure C.1).The number of properties annexing to the City in the last 3 years has stayed roughly the same, however the total acreage has dropped by more than 50% since FY1516 leading to a conclusion is that many of the new annexations are already urbanized lots. Table C.2 History of Annexations and Impervious Area, FY1516 to FY1819 Number of Properties Acres Impervious Area in City Limits, Impervious Area in USB, Year Annexed Annexed Acres Acres FY1819 13 6.6 2,286 2,570 FY1718 9 4.0 2,279 2,567 FY1617 11 6.6 2,274 2,561 FY1516 27 22.0 2,200 2,555 -, Annexation Year /171 / - Annexation Year �� Tualatin River -i �o1s /� V//77////f//: / i 2u„ , Watershed ✓ o,d % ..f' r •lf ,"� r• / / -2ote —2018 / r 1�. ryon Creek zon —2018 -w1ei40/ Watershed -2819 1)..vot / /—Cyr j;' _ ,,j' /a —Cty Boundary ii / r 4 / rr/ r 0 ni 00,g.Lth'8 Spnngbrook, ! Creek r \iil E ' Watershed Oswego Lake oodgo Watershed IA Willamette River Watershed 9 Oswego Lake Watershed /L-r Tualatin River Watfitshed Et IL _411 _i______ City of Lake Oswego City of Lake Oswego __x_I-- Watersheds and Annexations i Watersheds and Annexations t' Tualatin River Watershed Figure C.1. Annexations in Lake Oswego, FY1516 to FY1819 City of Lake Oswego_MS4 and TMDL Annual Report_FY1819 Page 42 There were no comprehensive plan or zoning changes in FY1819. There were no municipal code changes that affected density or allowable impervious area. There were 17 land use applications reviewed in FY1819 that involved sensitive lands or were within 50 ft of a waterway. Property owners submitting land use applications are required by code to engage the services of licensed professionals to delineate sensitive lands designations. If not already delineated. Delineations in FY1819 did not have a negative effect on the total acreage in the sensitive lands overlays. C.4 Water Quality All of the constituents identified as needing a TMDL, except stream temperature, are regulated through the City's Phase I NPDES MS4 permit and have waste load allocations (WLAs). These WLAs were established in 2008 and re-evaluated in the City's 2016 Pollution Load Reduction Evaluation (PLRE) and 2016 WLA Assessment. The following actions address the TMDL parameters except for stream temperature (See Table C.3): 1. Implementation of an erosion control program and a street sweeping program to reduce total suspended solids, bacteria, phosphorous, and mercury while stabilizing pH. 2. Implementation of a development review program to reduce stormwater volume and streambank erosion thereby reducing phosphorus, temperature, and mercury while increasing dissolved oxygen. 3. Maintenance of stormwater conveyance and water quality facilities to reduce total suspended solids, phosphorous, mercury, and total suspended solids while increasing dissolved oxygen. 4. Implementation of a cross-connection program to reduce bacteria. 5. Implementation of an illicit discharge and pesticide reduction program to reduce phosphorus and mercury while increasing dissolved oxygen and stabilizing pH. Table C.3. TMDL Parameters and Example Related City Activities to Reduce Loads Temperature Chlorophyll a Dissolved Mercury (Effective pH 1 Bacteria (Phosphorus) Oxygen(TSS 1) Watershed/City Activity Shade) Erosion Control and Street Sweeping Development Review Maintenance of Stormwater Infrastructure and Water Quality Facilities Wastewater-Stormwater Cross Connections Illicit Discharge Program Public Education Riparian Habitat Enhancement and Preservation 1 TSS—Total Suspended Solids Every month, the City collects instream water samples from six sites which are analyzed for 16 water quality parameters. Once every quarter,the City samples additional parameters from these sites(anions, cations, dissolved carbon, and total carbon). Field measurements such as stream temperature, dissolved City of Lake Oswego_MS4 and TMDL Annual Report_FY1819 Page 43 oxygen, turbidity, conductivity, pH, and estimated discharge are taken every month. Detailed water quality data collected as a part of the MS4 permit can be found in Appendix A of the City's MS4 report. Two of the sites in the City's monitoring network (Ball Creek and Carter Creek) discharge to Fanno Creek which is a tributary of the Tualatin River. The City also has sampling sites on Springbrook Creek, Boones Ferry Creek at Bryant Ave, and Lost Dog Creek; all of these sampling sites are located just upstream of their discharge to Oswego Lake. A sixth sampling site is located on Nettle Creek which is a tributary to Tryon Creek. The main section of the City's MS4 report contains an analysis of the progress made towards attaining WLAs. In summary, the pH WLA was reached in all of the monitored streams. Bacterial concentrations have been difficult for the City to reduce although the geomean of all streams was under the required 406 colonies/100mL geomean except for Springbrook Creek which was slightly elevated (407 colonies/100 mL. Dissolved oxygen levels were more difficult to assess.An evaluation of the total suspended solids and total volatile solids had a mixed result whereas the City's portable(field) multimeter showed an increase in Ball Creek of 4% and 6%, respectively. Phosphorous concentrations were either at or slightly above the required WLA. While Carter Creek reached a maximum temperature of 19.1°C (66°F), the average stream temperatures for Ball Creek and Carter Creek remained below the TMDL threshold of 18°C (64°F) as shown by the geomean of the summer temperatures (see Table C.4). Lost Dog Creek also spiked slightly above the TMDL threshold but its average summer temperatures also show that, in general, it stayed below the TMDL threshold. C.5 Temperature A marine climate, as found in the Willamette Valley, has mild rainy winters and hot dry summers resulting in very few rain events when air and stream temperatures are at their highest. Consequently,there is no WLA for stream temperatures and the TMDL for temperature is based on the migratory patterns of salmonid species. The City addresses temperature loading through the following metrics: A. Protection of existing riparian habitat through code enforcement of the sensitive lands Resource Protection (RP) overlay. B. Enhancement of existing riparian habitat by funding restoration of public and private properties. C. Enhancement and protection of existing shade in riparian corridors through enforcement of the City's municipal code and by educating the public on the value of shade and trees. C.5.1 Preservation of Riparian Habitat The City's sensitive lands designations overlay 120 acres which encompasses most of the riparian corridors within its jurisdictions. There were 17 land use applications and 57 building permits including new construction and remodels/additions issued in FY1819 for properties with a sensitive lands overlay. None of the projects with a building permit affected their sensitive lands area. Any development on properties with the riparian habitat overlay must mitigate negative impacts at a 1:1 ratio. City of Lake Oswego_MS4 and TMDL Annual Report_FY1819 Page 44 Table C.4. Selected Water Quality Data from Instream Monitoring Stations FY1819 FY1213 to FY1617 J C J - H H V al ulto - = N. J OA ... 00 - = N. Cr OA a) Q x .O - ‘no. 3 C\iA E O' X .O _i vo 3 -... E 0 v iv' a � o 0 v E o H •D � a ° o OiA v E o n: O O � �, c '-0 CO n: O O � m c ' f L y • 0 > (A L H u Q > N Y Watershed Statistic ; �, 0 11' �, o W Maximum 6.8 16.9 12.24 7.96 >2420 28.0 39 0.14 17.7 14.72 8.53 2419 72.5 69 0.93 Geomean 0.7 10.7 10.45 7.65 176 2.5 25 0.08 11.8 9.65 7.77 135 4.4 34 0.10 Ball Creek I Minimum 0.6 12.8 10.53 7.68 208 2.5 30 0.09 5.3 4.58 6.04 4 1.0 5 0.01 Summer 0.4 14.5 9.46 7.65 416 3.3 34 0.10 15.0 9.06 7.77 234 3.8 36 0.11 Winter 1.1 8.6 11.05 7.65 95 2.0 20 0.06 9.7 10.53 7.75 105 3.7 29 0.08 Maximum 7.0 19.1 11.52 7.52 1203 14.0 46 0.17 21.0 12.95 12.20 >2420 37.5 140 0.65 Geomean 0.9 10.4 8.02 7.20 93 4.5 31 0.10 12.2 7.14 7.54 120 3.7 39 0.10 Carter Creek Minimum 0.2 4.8 5.01 6.41 3 2.5 11 0.05 4.4 2.79 6.94 10 1.0 13 0.02 Summer 0.5 16.2 6.00 7.09 243 5.9 37 0.15 17.2 5.64 7.42 201 4.6 40 0.14 Winter 1.3 8.1 9.09 7.28 47 3.7 27 0.08 9.3 8.91 7.52 85 3.6 35 0.08 Maximum 2.9 17.0 13.41 7.89 >2420 10.5 66 0.15 16.9 16.21 8.62 2419 848.0 110 1.33 Geomean 0.4 9.0 10.57 7.44 205 3.0 31 0.07 10.3 10.11 7.69 152 6.2 35 0.10 Nettle Creek Minimum 0.1 4.2 5.86 6.86 9 1.0 16 0.04 2.8 4.70 6.41 11 1.0 5 0.01 Summer 0.1 13.9 8.47 7.41 362 5.1 40 0.11 14.6 8.80 7.68 210 6.3 38 0.10 Winter 1.0 6.9 12.05 7.47 491 2.6 26 0.06 7.8 11.40 7.61 164 4.5 33 0.09 Maximum 12.8 16.0 12.30 7.33 >2420 39.5 47 0.16 15.9 12.40 8.65 2076 253.8 120 1.85 Geomean 3.3 11.0 8.94 6.73 196 3.5 30 0.10 11.3 8.06 7.12 80 3.1 32 0.12 Springbrook Minimum 1.8 6.3 6.85 6.27 30 1.0 23 0.07 5.4 5.02 6.41 8 1.0 5 0.04 Creek Summer 2.2 14.1 7.27 6.59 407 2.4 28 0.10 14.2 7.08 6.88 115 2.9 30 0.12 Winter 4.3 9.3 10.06 6.83 116 4.6 31 0.10 9.5 9.31 7.14 97 3.6 34 0.12 Maximum 1.9 18.2 13.02 7.82 649 5.0 43 0.17 20.6 16.17 8.57 1203 48.0 54 1.60 Geomean 0.3 10.3 10.04 7.40 64 1.9 30 0.07 11.4 9.33 7.68 75 2.6 27 0.08 Lost Dog Minimum <0.1 4.9 7.07 6.90 14 1.0 21 0.03 3.3 4.43 6.79 1 1.0 5 0.02 Creek Summer 0.2 15.5 8.60 7.35 75 2.2 26 0.09 16.2 7.79 7.55 49 2.0 27 0.10 Winter 0.5 7.8 11.1 7.43 48 1.7 33 0.06 8.6 11.04 7.63 97 2.8 28 0.06 Maximum 4.8 16.1 11.17 7.01 1120 47.5 72 0.16 16.1 12.15 8.61 1046 100.0 160 1.00 Geomean 0.2 11.7 8.88 6.80 41 2.2 39 0.10 12.0 8.12 7.13 20 4.8 44 0.14 Boones Ferryl Minimum <0.1 6.9 7.50 6.42 2 1.0 18 0.08 3.3 2.56 6.49 1 1.0 17 0.05 l Summer 0.1 14.2 8.04 6.82 92 2.6 49 0.11 14.6 7.95 7.04 22 4.6 47 0.13 Winter 0.5 10.2 9.41 6.79 23 2.0 33 0.10 10.4 8.66 7.06 25 3.5 40 0.12 Other ways that the City protects riparian habitat is through code enforcement and modifications to municipal code. In FY1819, there were no modifications to the municipal code. There was one code enforcement case due to a sensitive lands violation that was resolved.A neighbor and his contractor pled guilty in criminal court (trespass), and in civil court to removing trees and other native plants from an adjacent property's riparian area. Substantial fines were levied and the disturbed areas must be planted with native plants before March 20, 2020. City of Lake Oswego_MS4 and TMDL Annual Report_FY1819 Page 45 C.5.2 Enhancement of Riparian Habitat The City provides enhancement of riparian habitat through Neighborhood Grants, funding of the Habitat Enhancement Program (HEP), partnering with the Audubon Society's Backyard Habitat Program, and providing technical expertise to the three local watershed councils operating within the City's jurisdiction. In FY1819,staff attended 10 Oswego Lake Watershed Council meetings and the "State of the Watershed" event; five Tryon Creek Watershed Council meetings and three invasive removal events; and two rainwater harvesting workshops sponsored by the Tualatin River Watershed Council but no meetings. The City uses the HEP to provide funds to local watershed councils for projects that enhance riparian habitat and provide public education. Applications are prioritized according to the amount of riparian habitat enhanced, connectivity to City projects or past projects, public education hours, and whether the project is in an area undergoing severe hydromodification as determined by the 2016 Hydromodification Assessment. In the last 4 fiscal years (FY1516 to FY1819),the City has provided funds to restore 11 acres through removal of invasive plants and installation of approximately 4,200 native trees and shrubs. The City provides $38,000 annually in support of the partnership between the Columbia Land Trust and the Audubon Society of Portland for the Backyard Habitat Certification Program and was 3rd in the region for participation in the program (https://create.piktochart.com/output/31607748-backvard-habitat- calendar-year-2018). The City had 24 new properties certified and 12 properties re-certified in FY1819. Two new demonstration sites were established for a total of 19 sites. Four certified properties had a sensitive lands overlay. Since the City started funding the program in 2011, there have been 137.7 acres enrolled and 202 certifications totaling 45 acres certified within the City. Currently, 26 acres have maintained their certification as of June 30, 2019 (see Figure C.2). In the last 4 fiscal years(July 1, 2015 to June 30, 2019), the participants representing 83 properties have planted 258 trees and 4,266 shrubs on 23 acres (see Table C.5). C.6 Adaptive Management Currently, the City is required to exclusively work with the Lake Oswego School District in regard to classroom instruction on watersheds. In addition,the City is required to provide two temperature-related articles to City residents. The City has many outreach programs in the Urban Forestry program,the Backyard Habitat program, and programs within the Parks and Recreation programs in addition to membership in several regional groups that have stormwater education as their mission (Regional Coalition of Clean Rivers and Streams, PSAs with KPTV, Tualatin Basin Public Awareness Campaign, and the state-wide Clean Rivers and Streams). In addition, the City provides funds to the local watershed councils which also have public outreach either through HEP projects or events such as the Stormwater Stars workshops. The City would like to replace two of its current educational requirements(see Table C.6)with an opportunity to either provide staff or funds to support the many groups already providing watershed-based workshops, presentations, or field trips for students in classrooms or affiliated with civic groups such as the Scouts. C.7 Other Activities While the City's TMDL Implementation Plan contains the previously detailed activities, it also contains other metrics as listed in Table C.7. City of Lake Oswego_MS4 and TMDL Annual Report_FY1819 Page 46 a q ; T± h- s a � rirolik - iii it •L 0 ®$"'°^roe 0 y - MI MI 8 ® "'®�� ® z ° ® and a 0 41 - ®0 0 s ® RQr ea b.aap, ® t, P�' 41111 - Melrose vi O°aN. P. 0 X ems° ® • �_ Ra • ' 0, a RerkNew pr .4 C Aver liP o Iron Z m O Kee Wa h S fWerBB .i � y1Neg 3 m� a ° GYd �i �Ave'a re 0 Meatlows 3 Y FR 4 F $ eRtl o "' eke '. YRd U embley ° Bo Rtl Bonita Rd 0$ - '2% ,�ua SE IKE pdF 0 PLake Grove Ave 0 m p, • d 1-aK — e� • P 05,�e9 y Pe �ro� t �� �' Feeve Oak P4.. `I' By' 0 0 • 5'N" �. e'`v s, r sou, snore Al® �0 _ 0 v a vvsrWrb,Cl ® ® " m m o H R a0 0 v.samrea 5 a ® ®s1�0%y • ® cF �Cner�Y �' ® � Ra `� u ® €� • ��� d tea' sOa ��* Jean Rd SW Jean Rd pVsA°ok hd'a S 6er9is Rd SSkylan0'0 _ RL C> e i 0 a _a t. .P- 0 41. cep m �' 0 0 0 ® ® Certified 6 Meow a C� "Rb 2 a: s 0 Currently Uncertified 5 ®® a �Qy,o Wllamette River Basin N o Rd 0 Childs Rd ® ,,,,Pc''' a Oswego Lake Basin s sK, tF f EL,Taulatin River Basin 0 0.25 0.5 0.75 1 M'beresr SW 1,4V, is %,,.,.,,,, swaaaR ,.. . Ides!.• Figure C.2. Backyard Habitat Program Participation, FY1516 to FY1819 Table C.5. Backyard Habitat Program Participation, FY1516 to FY1819 Watershed Number of Properties Acreage Trees Planted Shrubs Planted Certified Properties Springbrook 8 1.8 16 273 Tryon Creek 13 5.8 25 357 Tualatin River 8 2.2 24 536 Oswego Lake 28 6.6 122 1,343 Willamette River 8 2.6 40 596 Properties Currently Uncertified Springbrook 3 0.5 3 110 Tryon Creek 2 0.8 2 119 Tualatin River 3 0.6 0 230 Oswego Lake 8 1.6 13 661 Willamette River 2 0.4 13 41 Total Participation 83 22.9 258 4,266 City of Lake Oswego_MS4 and TMDL Annual Report_FY1819 Page 47 Table C.6. Requested Adaptive Management Original Language New Language Dept: Planning Engineering and Planning Support inclusion of surface water temperature and riparian habitat topics into the 5th grade watershed Support classes, presentations,workshops, or Goal curriculum for the Lake Oswego School District(LOSD). field trips for students that provide information Coordinate with Portland State and the LOSD to modify about watersheds, stormwater,or riparian the watershed curriculum. habitat and their effect on stream temperature Annually report on the number of classes, Tracking Tracking Measure: Annually track and report on by presentations,workshops,or field trips November 1st of each year: communication with the providing information on watersheds, Measure LOSD and (as applicable) resulting curriculum changes stormwater,or riparian habitats and their in support of this measurable goal. effect on stream temperatures and aquatic life. I Dept Engineering Delete this requirement Distribute a minimum of two temperature-related pieces of educational materials annually to City Goal residents. Educational materials may include articles in the local newspaper,website postings,or commercials/ advertisements. Delete this requirement Annually track and report on by November 1st of each Tracking year:the number and content of temperature-related Measure articles,commercials/advertisements,or notices distributed to City residents. Delete this requirement City of Lake Oswego_MS4 and TMDL Annual Report_FY1819 Page 48 Table C.7. Metrics for TMDL Management of Stream Temperatures Best Management Responsible Practice Department Measureable Goal Tracking Rubric FY1819 Progress Implement projects that Track the amount of City enhance riparian areas funds expended for programs From June 2015 to July 2019,the City has spent Program or increase effective to preserve or expand public approximately$815,400 on habitat restoration of Management Parks shade on City property. riparian habitat. public spaces. The City funds 3 different programs associated with riparian restoration on private property.The Backyard Habitat program is a partnership with the Columbia Land Trust and the Audubon Society; the Habitat Enhancement Program (HEP) is a partnership with the three local watershed councils active in the City; and the Neighborhood Enhancement Program (NEP) is a partnership with neighborhood associations and Partner with local non- homeowner associations. From July 2015 to June profit organizations to 2019,the City provided $152,000 through the support riparian habitat Track the amount of City Backyard Habitat program, approximately$10,000 enhancement or funds expended for programs through NEP, and approximately$120,500 to local Program protection on private to preserve or expand private watershed councils through HEP; an average of over Management Planning Parks property. riparian habitat. $70,000 each year. Report changes to the Implement policies and Stormwater Management procedures that promote Manual, Engineering Design groundwater recharge or Standards, and municipal Post- increase base flows in code that have an effect on Construction Engineering streams. groundwater recharge. There were no changes in FY1819. City of Lake Oswego_MS4 and TMDL Annual Report_FY1819 Page 49 Best Management Responsible Practice Department Measureable Goal Tracking Rubric FY1819 Progress Track comprehensive plan Post- Monitor changes to changes and their effect on There were no comprehensive plan nor zoning changes Construction Planning population density. impervious area. requested for FY1819. Track the number of Thirteen annexations were approved in FY1819 totaling properties annexed and 6.62 acres with most of area located in the Tryon Creek zoning/land use changes from watershed. the current reporting year and Post- Monitor changes to what is anticipated for the Based on current projections,the City expects that 4 Construction Planning population density. next reporting year. acres will be annexed in FY1920. Streams within the City's jurisdiction were generally Collect water quality within the limitations imposed by the TMDL thresholds. data at the instream A detailed analysis of the temperature data is provided monitoring stations Summarize water quality data in the main body of the TMDL report. A detailed required in the NPDES as it relates to TMDL analysis of the other parameters is provided in the Monitoring Engineering MS4 permit. thresholds. City's NPDES MS4 report. Collect water quality data on TMDL The City's continuous monitoring stations were parameters at the updated in FY1718 and FY1819 however the data from continuous monitoring Summarize water quality data that period is not considered reliable. The data from stations required in the as it relates to TMDL FY1920 is expected to be reliable enough to be Monitoring Engineering NPDES MS4 permit. thresholds. reported. Partner with other Document the status of the Clackamas co-permittees agreement with USGS and on funding a USGS other partners on the West The City provided $1,740 in FY1819 to operate and Monitoring Engineering gaging station. Linn USGS gaging station. maintain the West Linn USGS gaging station. City of Lake Oswego_MS4 and TMDL Annual Report_FY1819 Page 50 Best Management Responsible Practice Department Measureable Goal Tracking Rubric FY1819 Progress Support inclusion of surface water temperature and riparian habitat topics into the 5th grade Track and report on by watershed curriculum for November 1st of each year: the Lake Oswego School communication with the District (LOSD). Coordinate LOSD and (as applicable) with Portland State and the resulting curriculum There was no collaboration between the City and the Public Planning LOSD to modify the changes in support of this LOSD in regard to stream temperature-related Education Engineering watershed curriculum. measurable goal. education. The City's water conservation program provides audits for 59 residential and 2 commercial properties in FY1819. During the audits, owners were educated about the effect of the temperature of stormwater and irrigation water on our streams and lakes after it comes into contact with warm impervious areas. The City, in partnership with TBPAC, held 3 rainwater harvesting workshops ranging from rain barrels to large systems capable of retaining the yearly rainfall which it advertised through social media posts.The effect of temperature and stormwater in general were discussed at these Promote public workshops. education related to Track outreach efforts that urban forestry and the are related to stream The City held six urban forestry workshops providing Public Planning effect of city-wide shade temperature or canopy information on the Tree Code, instruction on tree Education Engineering on stream temperature. coverage. care, and encouraging maintenance of tree canopy. City of Lake Oswego_MS4 and TMDL Annual Report_FY1819 Page 51 Best Management Responsible Practice Department Measureable Goal Tracking Rubric FY1819 Progress There are approximately 120 acres within the City that have a sensitive lands designation.Two properties with a sensitive lands designation were developed in Preserve Track the acreage of sensitive FY1819.The properties contained a total of 36 acres Existing Require mitigation for lands that have been with 1.5 acres designated as riparian and 0.2 acres as Riparian development that affects developed and mitigation Habitat Benefit. None of the properties required Habitat Planning sensitive lands. required for development. mitigation. Building permits,for properties containing Address Title 3 and Title Track the number of building sensitive lands or a waterway, were issued for 57 Preserve 13 requirements that permits issued for properties projects in FY1819. None of those projects directly Existing relate to stream buffers with sensitive lands affected the sensitive lands or waterway corridors. Riparian and shade requirements delineations or that have land Mitigation for the impacts would have required at Habitat Planning along waterways. within 50ft of a waterway. a 1:1 ratio. Address Title 3 and Title Track the number of land use Preserve 13 requirements that applications for properties Existing relate to stream buffers with sensitive lands There were 17 land use applications filed in FY1819 Riparian Planning and shade requirements delineations or that have land that involved sensitive lands or were within 50 ft of a Habitat Engineering along waterways. within 50ft of a waterway. waterway. Address Title 3 and Title Preserve 13 requirements that Track modifications to stream No acreage was taken out of protected status. In every Existing relate to stream buffers buffers including the net instance where a riparian protection area, stream Riparian and shade requirements acreage lost or gained from corridor, or wetland is developed,the developer is Habitat Planning along waterways. the delineations. required to mitigate at a 1:1 ratio. City of Lake Oswego_MS4 and TMDL Annual Report_FY1819 Page 52 Best Management Responsible Practice Department Measureable Goal Tracking Rubric FY1819 Progress When new LiDAR data is available: Estimate change in effective shade relative to adoption of Sensitive Lands revision and based on Address Title 3 and Title development activity. Preserve 13 requirements that Compare expected change Existing relate to stream buffers with the actual change as Riparian and shade requirements shown by the use of LiDAR The new LiDAR was flown in Summer 2019 but was not Habitat Engineering along waterways. and multi-spectral imagery. available to address this metric during FY1819. Address Title 3 and Title Preserve 13 requirements that Track modifications to the Existing relate to stream buffers municipal code and other There were no modifications to the municipal code or Riparian Engineering and shade requirements planning documents as they other planning documents that related to stream Habitat Planning along waterways. relate to stream temperature. temperature. Address Title 3 and Title There was one code enforcement case due to a Preserve 13 requirements that Track the number of sensitive lands violation. An action date of March 20, Existing relate to stream buffers municipal code violations that 2020 was approved by the Lake Oswego Municipal Riparian and shade requirements affect sensitive lands or areas Court to replant the riparian area with native trees, Habitat Planning along waterways. within 50ft of a waterway. shrubs, and groundcovers. City of Lake Oswego_MS4 and TMDL Annual Report_FY1819 Page 53 Best Management Responsible Practice Department Measureable Goal Tracking Rubric FY1819 Progress Fourteen projects in the 2015 Hydromodification Assessment were flagged as having the potential for significant hydromodification benefits. Of those projects,the Operations Facility was finished in FY1718.Another project, D Ave, diverts stormwater Address Title 3 and Title Track the number of projects into new stormwater facilities;the project was almost Preserve 13 requirements that that address but not fully complete for FY1819 but will be part of Existing relate to stream buffers hydromodification (see 2016 the FY1920 report.A third project,the Wembley Park Riparian and shade requirements Hydromodification renovation, is scheduled for construction in 2020 with Habitat Engineering along waterways. Assessment). completion in 2021. Preserve Existing Actively restore and Track the acreage under There are approximately 186 acres of public property Riparian maintain public riparian active restoration. Track the under active restoration and 162 acres that have been Habitat Parks habitat. acreage being maintained. restored and in the maintenance phase. Increase Address Title 3 and Title Existing Shade 13 requirements that Track the number of and Improve relate to stream buffers municipal code violations Existing and shade requirements that affect tree canopy in the There were 13 code enforcement cases conducted Habitat Planning along waterways. City. because of trees being removed without a permit. Evaluate the amount of Increase Address Title 3 and Title effective shade provided by Existing Shade 13 requirements that riparian protections in and Improve relate to stream buffers relation to TMDL target in the Existing and shade requirements City's TMDL Implementation The new LiDAR data is currently being processed, Habitat Engineering along waterways. Plan. however it is unclear as to when it will be released. City of Lake Oswego_MS4 and TMDL Annual Report_FY1819 Page 54 Best Management Responsible Practice Department Measureable Goal Tracking Rubric FY1819 Progress The City partnered with other MS4 permittees to have the USGS map cold water refugia on the Willamette. Develop implementation As expected,the Willamette River has a well-mixed Increase strategy (including funding, temperature column whereas the areas of cold water Existing Shade property acquisition, and refugia are its relatively small tributaries. The City has and Improve Create, Enhance, or design concept)for not yet determined an implementation strategy for Existing Protect Cold Water preserving, enhancing or improving specific areas of cold water refugia that Habitat Engineering Refugia. creating cold water refugia. would have an appreciable effect. Increase Track the number of projects Existing Shade identified and constructed (or and Improve Create, Enhance, or in design phase)that Existing Protect Cold Water preserve, enhance or create There were no projects implemented in FY18-19 that Habitat Engineering Refugia. cold water refugia. addressed cold water refugia. Increase Existing Shade Implement projects that and Improve enhance riparian areas Track changes to the HEP Existing or increase effective application process or No changes were made to the HEP prioritization Habitat Parks shade on City property. prioritization. criteria in FY1819. Increase Track changes or Existing Shade Implement projects that implementation steps to Parks and Improve enhance riparian areas Master Plans that relate to Existing or increase effective riparian protection or There were no changes to the status or content of the Habitat Parks shade on City property. effective shade. City's Park Master Plans in FY1819. City of Lake Oswego_MS4 and TMDL Annual Report_FY1819 Page 55 Best Management Responsible Practice Department Measureable Goal Tracking Rubric FY1819 Progress The Backyard Habitat Certification Program certified 24 properties and re-certified 12 properties in FY1819. Owners of 41 properties are currently going through the process of certification but were not certified by the end of FY1819.The program has been ongoing since 2011 with almost Partner with local non- 45 acres becoming certified at least once and over Increase profit organizations to 26 acres retaining or receiving their certification as Existing Shade support riparian habitat of 6/30/19. In 2018,the City was 3rd in the region and Improve enhancement or Track the number of (https://create.piktochart.com/output/31607748- Existing protection on private properties participating in the backyard-habitat-calendar-year-2018)for Habitat Planning property. Backyard Habitat Program. participation in the program. Partner with local non- Increase profit organizations to Track the number of One property(4.5 acres)was certified by Backyard Existing Shade support riparian habitat properties participating in the Habitat Certification Program in FY1819 with either a and Improve enhancement or Backyard Habitat Program riparian habitat designation or within 50 ft of a Existing protection on private that have sensitive lands or waterway.Three properties were certified that have a Habitat Planning property. are within 50ft of a waterway. Resource Conservation designation. In the Backyard Habitat Certification Program, property owners on 83 parcels (22.9 acres) have planted 258 trees and 4,266 shrubs as part of their certification process from FY1516 to FY1819. Of those, 19 acres have retained their certification. Partner with local non- Track the amount of Increase profit organizations to additional shade (or number From 2015 to 2019, the City provided funds through Existing Shade support riparian habitat of trees and shrubs planted) its Habitat Enhancement Program to restore and Improve enhancement or obtained as a result of City approximately 11 acres through removing invasive Existing Planning protection on private partnerships, incentives, and plants and installing approximately 4,200 trees and Habitat Parks property. regulations. shrubs. City of Lake Oswego_MS4 and TMDL Annual Report_FY1819 Page 56 Best Management Responsible Practice Department Measureable Goal Tracking Rubric FY1819 Progress From 2015 to 2019, the City provided funds through the HEP to restore approximately 11 acres through removing invasive plants and installing approximately 4,200 trees and shrubs.Through the Partner with local non- NEP process and its partnership with the Columbia Increase profit organizations to Land Trust and Audubon Society of Portland's Existing Shade support riparian habitat Track the acreage (or the Backyard Habitat Certification program,the City has and Improve enhancement or number of trees and shrubs assisted in restoring the riparian habitat of Existing Planning protection on private planted) with increased shade properties with a total acreage of 40 acres. Not all of Habitat Engineering property. due to City partnerships. the acreage in each property was riparian habitat. Approximately$9,100 in City grants were provided to Homeowner Associations for restoration of private property.The funds were almost evenly split Partner with local non- between the Tualatin River and Springbrook Creek Increase profit organizations to watersheds.The City provided the Backyard Habitat Existing Shade support riparian habitat Track the amount of funds Certification program with $38,000 for private and Improve enhancement or expended for riparian habitat habitat preservation projects.The City disbursed Existing Planning protection on private enhancement or protection approximately$317,400 to local watershed councils Habitat Parks property. on private property. through its Habitat Enhancement Program. Staff attended ten Oswego Lake Watershed Council (OLWC) meetings and the "State of the Watershed" event. Staff attended five Tryon Creek Watershed Partner with local non- Track the number of meetings Council (TCWC) meetings and three TCWC-sponsored Increase profit organizations to or events sponsored by non- invasive removal events. Staff attended two rainwater Existing Shade support riparian habitat profit groups that were harvesting workshops sponsored by the Tualatin River and Improve enhancement or attended by staff. Track Watershed Council. Staff reviewed Habitat Existing protection on private whether technical expertise Enhancement Project applications and provided Habitat Engineering property. was provided. technical expertise for all three watershed councils. City of Lake Oswego_MS4 and TMDL Annual Report_FY1819 Page 57